Mario-style platformer · deepseek-v3.1-terminus

Using the pre-provided phaser.min.js (global Phaser), build a playable side-scrolling platformer in the classic Mario style: run and jump across scrolling platforms, stomp enemies, collect coins, and reach a goal flag. Use ONLY procedurally generated graphics, no external image or audio assets.

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transcript · 58 messages

user

assistant

thinking

I'll start by exploring the current directory to see what files are present, especially phaser.min.js. Then I'll create index.html with embedded CSS and JavaScript, using Phaser to create a side-scrolling platformer with procedural graphics. Let's start with listing files.

→ bash {"command":"ls -la"}

toolResult

total 1156 drwxr-sr-x. 2 node node 27 Aug 1 17:55 . drwxrwsrwx. 3 root node 16 Aug 1 17:55 .. -rw-r--r--. 1 node node 1181917 Aug 1 17:55 phaser.min.js

assistant

thinking

Great, phaser.min.js is present. Now I need to write index.html with inline CSS and JS. I'll need to generate graphics procedurally using Phaser's graphics API, create a tilemap or platforms, player, enemies, coins, flag, physics, etc.

Let's think about the game design:

- Side-scrolling platformer with horizontal scrolling camera.
- Player can run left/right, jump, stomp enemies from above.
- Enemies walk back and forth, can be stomped; touching them from sides kills player.
- Coins to collect.
- Goal flag at the end of the level.
- Procedurally generated level: maybe a series of platforms with gaps, some moving platforms, enemies placed randomly.
- Procedural graphics: use simple shapes (rectangles, circles) with colors. Use gradient fills or patterns for ground, player, enemies, coins, flag.

I'll create a single HTML file with Phaser 3. I'll use the Arcade physics (simple). I'll need to create classes for Player, Enemy, Coin, Flag.

Let's start by writing the index.html skeleton with style and script sections. I'll write the entire file. Let's first check if there are any other files needed, but we'll just embed everything.

I'll create index.html in /tmp/ws. Let's start.

assistant

thinking

Great, phaser.min.js is present. Now I'll create index.html with a simple structure, loading Phaser from that file. I'll design the game with:

- Player character (rectangle with color)
- Platforms (brown rectangles)
- Enemies (red rectangles that move back and forth)
- Coins (yellow circles)
- Goal flag (green rectangle with a flagpole)
- Physics (arcade physics)
- Side-scrolling camera that follows player
- Procedural generation of level segments (maybe infinite or fixed length)

Let's first check the Phaser version by reading the first line of the file? Might be Phaser 3. We'll assume Phaser 3. We'll write the game in a single script tag.

We'll need to use canvas graphics (Graphics, Shapes) to draw everything.

I'll create a simple level generation: create a ground, some floating platforms, enemies, coins, and a goal at the end.

Game mechanics:
- Arrow keys for left/right, up to jump (space or up arrow)
- Player can stomp enemies by jumping on top of them (enemy dies)
- Collect coins for score
- Reach goal flag to win (show message)

We'll also add a score display and lives (maybe 3 lives).

Let's start writing the index.html. I'll use a modular structure within script.

Let's write the file now.

→ write index.html (13044 bytes)

toolResult

Successfully wrote 13044 bytes to index.html

assistant

thinking

Now let's test the game by opening it in a headless browser? We can check if there are any obvious errors by loading the HTML and checking console. Let's create a simple Node script to validate syntax? But we can also just open the file in a headless browser using puppeteer? Might be heavy. Let's instead run a quick Python HTTP server and use curl to see if the file loads. But we can also just check the HTML for any obvious bugs.

I'll read back the file to ensure it's correct. Let's also check if there are any missing semicolons or incorrect references.

But first, let's see if the game might have issues with physics groups: we added groundBody as static group, but we added its children to platforms group. That might cause duplication? But we only need one collision group. Let's refactor: we can just add ground as a static sprite directly to platforms group.

Also enemies have allowGravity false and immovable true; they might not move. We'll set allowGravity false but they should still move via velocityX. That's fine.

We also need to make enemies reverse direction when hitting walls or edges. We'll add a simple update for each enemy to flip velocity when hitting platform edges? Since they are not colliding with platforms (we added collider), they will bounce off? Actually we added collider between enemies and platforms, so they will collide and reverse direction automatically because they are not immovable? Wait: we set immovable: true, which means they won't move when collided with other bodies. That's not what we want. We want enemies to move back and forth, and when they hit a wall they should turn around. We can set immovable false, allowGravity false, and set collideWorldBounds true. Also they should collide with platforms and reverse direction. Let's adjust.

Also player stomp detection: we used player.body.touching.down && enemy.body.touching.up. That works only if both are touching. Might be better to check relative positions.

Let's edit the code. We'll replace the enemy creation and collision logic.

We'll also adjust ground generation: create a single ground platform using platforms.create.

Let's edit the file using the edit tool. We'll need to replace the create function section. I'll do it in multiple edits to avoid mistakes.

First, let's read the file to see its current content.

→ read {"path":"index.html","offset":1,"limit":100}

toolResult

assistant

thinking

I'll read the rest of the script part. Let's find the create function. Let's search with bash:

→ bash {"command":"grep -n \"function create\" index.html"}

toolResult

161: function create() {

assistant

thinking

Let's view lines around that. Let's read from line 150 to maybe 250.

→ read {"path":"index.html","offset":150,"limit":150}

toolResult

assistant

thinking

Now I need to edit the ground creation and enemy group creation. Let's do multiple edits.

First, replace the ground creation lines with simpler ground. Also we need to ensure platforms group is created before adding ground. Let's change lines from "// Create ground" to after "platforms.addMultiple(...)". We'll replace that block.

Let's create edit: replace from "            // Create ground\n            platforms = this.physics.add.staticGroup();\n            const ground = this.add.graphics();\n            ground.fillStyle(0x8B4513, 1);\n            ground.fillRect(0, 600 - groundHeight, worldWidth, groundHeight);\n            let groundBody = this.physics.add.staticGroup();\n            groundBody.create(worldWidth / 2, 600 - groundHeight / 2, null).setSize(worldWidth, groundHeight).setVisible(false);\n            platforms.addMultiple(groundBody.getChildren());" with new block.

Let's write new ground creation: create a static sprite for ground and add to platforms group. Also draw graphics attached to that sprite.

We'll also need to adjust the graphics so they appear at correct position. We'll create a ground sprite with graphics child.

Let's do that now.

→ edit

{"edits":[{"newText":"            // Create ground\n            platforms = this.physics.add.staticGroup();\n            const ground = this

toolResult

Successfully replaced 1 block(s) in index.html.

assistant

thinking

Now edit enemy group creation. We'll change the group configuration to allow movement, gravity false, collideWorldBounds true, and bounce. Let's find the line: "            enemies = this.physics.add.group({\n                allowGravity: false,\n                immovable: true\n            });" Replace with new config. Let's also add a property to each enemy to track direction.

We'll also need to adjust the collider: enemies should collide with platforms and reverse direction automatically (by bouncing). We'll set bounce X = 1. So we need to set bounce when creating each enemy.

Let's edit that line and also adjust generateEnemies function to set bounce and collideWorldBounds. We'll change generateEnemies accordingly.

First, locate the line. Let's search for "enemies = this.physics.add.group". We'll replace that block.

Let's read lines around that again to ensure exact old text. Let's read from line 180 to 190. Let's get line numbers with bash:

→ bash {"command":"sed -n '180,190p' index.html"}

toolResult

player.setBounce(0.2); player.setCollideWorldBounds(true); player.body.setSize(32, 48); // Draw player as a blue rectangle with eyes const playerGfx = this.add.graphics(); playerGfx.fillStyle(0x1E90FF, 1); playerGfx.fillRect(-16, -24, 32, 48); // eyes playerGfx.fillStyle(0xFFFFFF, 1); playerGfx.fillCircle(-6, -18, 4); playerGfx.fillCircle(6, -18, 4);

assistant

thinking

Not there. Let's search with grep -n again:

→ bash {"command":"grep -n \"enemies = this.physics.add.group\" index.html"}

toolResult

197: enemies = this.physics.add.group({

assistant

thinking

Now read lines 197-205. Let's view them:

→ read {"path":"index.html"}

toolResult

<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Procedural Mario‑Style Platformer</title> <style> * { margin: 0; padding: 0; box-sizing: border-box; } body { display: flex; justify-content: center; align-items: center; min-height: 100vh; background: linear-gradient(to bottom, #87CEEB, #E0F7FF); font-family: 'Courier New', monospace; overflow: hidden; } #game-container { width: 800px; height: 600px; border: 4px solid #333; border-radius: 8px; box-shadow: 0 10px 30px rgba(0,0,0,0.5); overflow: hidden; } canvas { display: block; } .instructions { position: absolute; top: 20px; left: 20px; background: rgba(255, 255, 255, 0.9); padding: 15px; border-radius: 10px; max-width: 300px; font-size: 14px; line-height: 1.4; box-shadow: 0 4px 12px rgba(0,0,0,0.2); } .instructions h3 { margin-bottom: 8px; color: #D32F2F; } .instructions ul { margin-left: 20px; } .instructions li { margin-bottom: 4px; } .score-board { position: absolute; top: 20px; right: 20px; background: rgba(255, 255, 255, 0.9); padding: 15px; border-radius: 10px; font-size: 18px; font-weight: bold; color: #2E7D32; box-shadow: 0 4px 12px rgba(0,0,0,0.2); } .game-over { position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); background: rgba(0, 0, 0, 0.85); color: white; padding: 30px; border-radius: 15px; text-align: center; font-size: 24px; display: none; box-shadow: 0 0 30px rgba(255, 255, 255, 0.3); } .game-over button { margin-top: 20px; padding: 10px 25px; font-size: 18px; background: #4CAF50; color: white; border: none; border-radius: 8px; cursor: pointer; transition: background 0.3s; } .game-over button:hover { background: #388E3C; } </style> </head> <body> <div id="game-container"></div> <div class="instructions"> <h3>How to Play</h3> <ul> <li><strong>← →</strong> Move left/right</li> <li><strong>Space / ↑</strong> Jump</li> <li>Stomp enemies from above</li> <li>Collect coins for points</li> <li>Reach the flag to win!</li> <li>Avoid falling off the world</li> </ul> </div> <div class="score-board"> Score: <span id="score">0</span> | Lives: <span id="lives">3</span> </div> <div class="game-over" id="gameOver"> <div id="gameOverMessage">You Win!</div> <button onclick="resetGame()">Play Again</button> </div> <script src="phaser.min.js"></script> <script> // Game configuration const config = { type: Phaser.AUTO, width: 800, height: 600, parent: 'game-container', physics: { default: 'arcade', arcade: { gravity: { y: 800 }, debug: false } }, scene: { preload, create, update } }; // Global variables let player; let platforms; let enemies; let coins; let flag; let cursors; let score = 0; let lives = 3; let gameOver = false; const game = new Phaser.Game(config); const worldWidth = 4000; const groundHeight = 64; const platformColors = [0x8B4513, 0xA0522D, 0xD2691E]; const enemyColors = [0xFF0000, 0xDC143C, 0xB22222]; const coinColors = [0xFFD700, 0xFFC125, 0xEEDD82]; function preload() { // No external assets } function create() { // Set world bounds this.physics.world.setBounds(0, 0, worldWidth, 600); // Create ground platforms = this.physics.add.staticGroup(); const ground = this.physics.add.staticSprite(worldWidth / 2, 600 - groundHeight / 2, null); ground.body.setSize(worldWidth, groundHeight); const groundGfx = this.add.graphics(); groundGfx.fillStyle(0x8B4513, 1); groundGfx.fillRect(-worldWidth / 2, -groundHeight / 2, worldWidth, groundHeight); ground.add(groundGfx); platforms.add(ground); // Generate platforms generatePlatforms(this); // Create player player = this.physics.add.sprite(100, 400, null); player.setBounce(0.2); player.setCollideWorldBounds(true); player.body.setSize(32, 48); // Draw player as a blue rectangle with eyes const playerGfx = this.add.graphics(); playerGfx.fillStyle(0x1E90FF, 1); playerGfx.fillRect(-16, -24, 32, 48); // eyes playerGfx.fillStyle(0xFFFFFF, 1); playerGfx.fillCircle(-6, -18, 4); playerGfx.fillCircle(6, -18, 4); playerGfx.fillStyle(0x000000, 1); playerGfx.fillCircle(-6, -18, 2); playerGfx.fillCircle(6, -18, 2); player.add(playerGfx); // Create enemies group enemies = this.physics.add.group({ allowGravity: false, immovable: true }); generateEnemies(this); // Create coins group coins = this.physics.add.group(); generateCoins(this); // Create goal flag flag = this.physics.add.staticSprite(worldWidth - 150, 600 - groundHeight - 128, null); flag.body.setSize(10, 128); const flagGfx = this.add.graphics(); flagGfx.fillStyle(0x808080, 1); flagGfx.fillRect(-5, -128, 10, 128); // pole flagGfx.fillStyle(0x00FF00, 1); flagGfx.fillTriangle(0, -128, 0, -64, 64, -96); // flag flag.add(flagGfx); // Collisions this.physics.add.collider(player, platforms); this.physics.add.collider(enemies, platforms); this.physics.add.overlap(player, enemies, stompEnemy, null, this); this.physics.add.overlap(player, coins, collectCoin, null, this); this.physics.add.overlap(player, flag, reachFlag, null, this); // Camera this.cameras.main.setBounds(0, 0, worldWidth, 600); this.cameras.main.startFollow(player, true, 0.1, 0.1); // Input cursors = this.input.keyboard.createCursorKeys(); this.input.keyboard.on('keydown-SPACE', jump, this); // UI updates updateScore(); updateLives(); } function update() { if (gameOver) return; // Player movement const speed = 300; if (cursors.left.isDown) { player.setVelocityX(-speed); player.scaleX = -1; } else if (cursors.right.isDown) { player.setVelocityX(speed); player.scaleX = 1; } else { player.setVelocityX(0); } // Jump if ((cursors.up.isDown || cursors.space.isDown) && player.body.touching.down) { player.setVelocityY(-450); } // Fall off world if (player.y > 600) { loseLife(); } } function generatePlatforms(scene) { const platformWidth = 128; const platformHeight = 32; const gap = 200; let x = 300; while (x < worldWidth - 300) { const y = Phaser.Math.Between(300, 450); const color = Phaser.Math.RND.pick(platformColors); const gfx = scene.add.graphics(); gfx.fillStyle(color, 1); gfx.fillRect(-platformWidth/2, -platformHeight/2, platformWidth, platformHeight); const platform = scene.physics.add.staticSprite(x, y, null); platform.body.setSize(platformWidth, platformHeight); platform.add(gfx); platforms.add(platform); x += gap + Phaser.Math.Between(100, 300); } } function generateEnemies(scene) { const enemyWidth = 48; const enemyHeight = 48; for (let i = 0; i < 10; i++) { const x = Phaser.Math.Between(500, worldWidth - 500); const y = 600 - groundHeight - enemyHeight / 2 - 20; const enemy = scene.physics.add.sprite(x, y, null); enemy.body.setSize(enemyWidth, enemyHeight); enemy.setVelocityX(Phaser.Math.Between(-80, 80)); const color = Phaser.Math.RND.pick(enemyColors); const gfx = scene.add.graphics(); gfx.fillStyle(color, 1); gfx.fillRect(-enemyWidth/2, -enemyHeight/2, enemyWidth, enemyHeight); // eyes gfx.fillStyle(0xFFFFFF, 1); gfx.fillCircle(-10, -10, 6); gfx.fillCircle(10, -10, 6); gfx.fillStyle(0x000000, 1); gfx.fillCircle(-10, -10, 3); gfx.fillCircle(10, -10, 3); enemy.add(gfx); enemies.add(enemy); } } function generateCoins(scene) { const coinRadius = 12; for (let i = 0; i < 30; i++) { const x = Phaser.Math.Between(200, worldWidth - 200); const y = Phaser.Math.Between(100, 400); const coin = scene.physics.add.sprite(x, y, null); coin.body.setSize(coinRadius * 2, coinRadius * 2); const color = Phaser.Math.RND.pick(coinColors); const gfx = scene.add.graphics(); gfx.fillStyle(color, 1); gfx.fillCircle(0, 0, coinRadius); // shine gfx.fillStyle(0xFFFFFF, 0.7); gfx.fillCircle(-coinRadius/3, -coinRadius/3, coinRadius/4); coin.add(gfx); coins.add(coin); } } function stompEnemy(player, enemy) { // Only stomp if player is above enemy if (player.body.touching.down && enemy.body.touching.up) { enemy.destroy(); score += 100; updateScore(); // bounce player.setVelocityY(-300); } else { // player hit enemy from side -> lose life loseLife(); } } function collectCoin(player, coin) { coin.destroy(); score += 50; updateScore(); } function reachFlag() { gameOver = true; document.getElementById('gameOverMessage').textContent = 'You Win! Score: ' + score; document.getElementById('gameOver').style.display = 'block'; } function loseLife() { lives--; updateLives(); if (lives <= 0) { gameOver = true; document.getElementById('gameOverMessage').textContent = 'Game Over! Score: ' + score; document.getElementById('gameOver').style.display = 'block'; } else { // reset player position player.setPosition(100, 400); player.setVelocity(0, 0); } } function jump() { if (player.body.touching.down) { player.setVelocityY(-450); } } function updateScore() { document.getElementById('score').textContent = score; } function updateLives() { document.getElementById('lives').textContent = lives; } function resetGame() { score = 0; lives = 3; gameOver = false; document.getElementById('gameOver').style.display = 'none'; game.scene.scenes[0].scene.restart(); } </script> </body> </html>

assistant

thinking

Now I need to edit the enemy group creation and generateEnemies. Let's first replace the group creation lines. The old text is exactly:

            enemies = this.physics.add.group({
                allowGravity: false,
                immovable: true
            });

We'll replace with:

            enemies = this.physics.add.group({
                allowGravity: false,
                collideWorldBounds: true,
                bounceX: 1
            });

But note: we also want enemies to collide with platforms and bounce. We'll keep the collider between enemies and platforms. With bounceX set to 1, they'll bounce off platforms as well (since platforms are static). However we need to ensure they are not immovable. Let's set immovable false (default). We'll also set drag 0.

Let's do edit. Let's find the exact line numbers again. Use sed to replace. But we'll use edit tool with oldText. We'll also need to adjust generateEnemies to set bounceX and maybe velocityX. We'll keep the velocityX random but ensure direction is consistent.

Let's first edit the group creation. Let's also add a comment. Let's do it now.

→ edit

{"edits":[{"newText":"            enemies = this.physics.add.group({\n                allowGravity: false,\n                collideWorldBoun

toolResult

Successfully replaced 1 block(s) in index.html.

assistant

thinking

Now we need to modify generateEnemies to set bounceX and maybe velocityX. Also we need to ensure enemy is added to the group with the group's properties. Since we add via enemies.add(enemy), the group settings may apply? I think group configuration only affects children created via group.create, not added sprites. So we need to set bounceX and collideWorldBounds on each enemy individually. Let's update generateEnemies accordingly.

Let's find the generateEnemies function. We'll replace the whole function. Let's get its exact text from "function generateEnemies(scene) {" to the closing "}". We'll need to see the entire function. Let's read from line maybe 260 to 310. Let's do a quick bash to find line numbers:

→ bash {"command":"grep -n \"function generateEnemies\" index.html"}

toolResult

283: function generateEnemies(scene) {

assistant

thinking

Now find the line number of the closing brace for that function. Let's read from line 283 to maybe 320. Let's output lines:

→ bash {"command":"sed -n '283,320p' index.html"}

toolResult

function generateEnemies(scene) { const enemyWidth = 48; const enemyHeight = 48; for (let i = 0; i < 10; i++) { const x = Phaser.Math.Between(500, worldWidth - 500); const y = 600 - groundHeight - enemyHeight / 2 - 20; const enemy = scene.physics.add.sprite(x, y, null); enemy.body.setSize(enemyWidth, enemyHeight); enemy.setVelocityX(Phaser.Math.Between(-80, 80)); const color = Phaser.Math.RND.pick(enemyColors); const gfx = scene.add.graphics(); gfx.fillStyle(color, 1); gfx.fillRect(-enemyWidth/2, -enemyHeight/2, enemyWidth, enemyHeight); // eyes gfx.fillStyle(0xFFFFFF, 1); gfx.fillCircle(-10, -10, 6); gfx.fillCircle(10, -10, 6); gfx.fillStyle(0x000000, 1); gfx.fillCircle(-10, -10, 3); gfx.fillCircle(10, -10, 3); enemy.add(gfx); enemies.add(enemy); } } function generateCoins(scene) { const coinRadius = 12; for (let i = 0; i < 30; i++) { const x = Phaser.Math.Between(200, worldWidth - 200); const y = Phaser.Math.Between(100, 400); const coin = scene.physics.add.sprite(x, y, null); coin.body.setSize(coinRadius * 2, coinRadius * 2); const color = Phaser.Math.RND.pick(coinColors); const gfx = scene.add.graphics(); gfx.fillStyle(color, 1); gfx.fillCircle(0, 0, coinRadius); // shine gfx.fillStyle(0xFFFFFF, 0.7);

assistant

thinking

Great. So the function ends at line before "function generateCoins". Let's count lines; we'll replace the whole block.

We need to modify the enemy creation to set bounceX and collideWorldBounds. Also we can set velocityX with a random direction but ensure speed magnitude.

Let's write new generateEnemies:

- enemy.setBounceX(1)
- enemy.setCollideWorldBounds(true)
- enemy.setVelocityX(Phaser.Math.Between(-100, 100)) maybe ensure not zero.

Let's replace. We'll also adjust stompEnemy detection: we can check if player is above enemy using player.y < enemy.y - 10 and player.body.velocity.y > 0 (falling). Simpler: we can keep touching detection but might be unreliable. Let's change stompEnemy later.

Now replace generateEnemies. Let's create edit. We need the exact oldText from line 283 to the line before "        function generateCoins". Let's capture from "function generateEnemies(scene) {" to the closing "}" (including the line with "        }"). We'll need to include the indentation (12 spaces? Actually the file uses 8 spaces per indent? Let's copy exactly the block we printed above, but ensure we include the final "        }". Let's get the exact text using a more precise method: read from line 283 to line 304 maybe. Let's count lines in the block: from opening to closing brace, there are 22 lines? Let's just copy the block we printed (excluding the line after). We'll use that as oldText.

We'll replace with new block. Let's write new block:

→ edit

{"edits":[{"newText":"        function generateEnemies(scene) {\n            const enemyWidth = 48;\n            const enemyHeight = 48;\n

toolResult

Successfully replaced 1 block(s) in index.html.

assistant

thinking

Now we need to adjust stompEnemy detection. Let's replace the stompEnemy function with better logic: check if player's bottom is above enemy's top (player.y + player.height/2 < enemy.y - enemy.height/2) and player is falling (player.body.velocity.y > 0). Actually we need to check if player is above enemy and moving downward. Let's implement.

Find stompEnemy function line. Let's grep:

→ bash {"command":"grep -n \"function stompEnemy\" index.html"}

toolResult

329: function stompEnemy(player, enemy) {

assistant

thinking

Read from line 329 to maybe 345. Let's view:

→ bash {"command":"sed -n '329,345p' index.html"}

toolResult

assistant

thinking

We'll replace the whole function. Let's compute player and enemy bounds. We'll use player.body.y, enemy.body.y, and their half heights. We'll also check player is falling (velocityY > 0). Let's write new function.

We'll also need to ensure enemy is not already destroyed. We'll also add a small threshold.

Let's replace:

→ edit

{"edits":[{"newText":"        function stompEnemy(player, enemy) {\n            // Check if player is above enemy and falling\n            c

toolResult

Successfully replaced 1 block(s) in index.html.

assistant

thinking

Now we need to adjust the player body halfHeight? Actually body.halfHeight is not a property. In arcade physics, body.halfHeight is available? Let's check Phaser Arcade body: it has `halfWidth` and `halfHeight`. I think they exist. However we can use `player.body.height` and `player.body.width`. But halfHeight is indeed a property. Let's verify: In Phaser 3, Arcade Physics Body has `halfHeight` and `halfWidth`. Yes, they are used for bounds. We'll assume they exist.

Alternatively we can compute using `player.body.height / 2`. Let's change to `player.body.height / 2`. Let's do another edit.

We'll replace the two lines with computed half heights.

Let's get the exact new function again. Let's read lines around it to ensure we capture correctly. We'll replace with a version that uses body.height.

We'll also add a safety check that enemy is alive.

Let's write new function again:

→ edit

{"edits":[{"newText":"        function stompEnemy(player, enemy) {\n            // Check if player is above enemy and falling\n            c

toolResult

Successfully replaced 1 block(s) in index.html.

assistant

thinking

Now we need to adjust the player jump key detection: currently we have both space and up arrow. However we also added a separate keydown-SPACE listener that calls jump. That may cause double jumps. Let's keep only the update check for up/space while touching down. We'll keep the listener but maybe we should remove it to avoid conflict. Let's comment out the line `this.input.keyboard.on('keydown-SPACE', jump, this);` because jump is already handled in update via cursors.space.isDown. Actually we need to keep both because the update checks cursors.space.isDown (which is continuous). That's fine. However we also have jump function that does the same check. Let's keep both; they won't double jump because the jump function also checks touching.down. But we can remove the listener to simplify. Let's remove it.

Find that line in create function. Let's search for "keydown-SPACE". We'll replace with a comment. Let's get the line and surrounding lines.

Let's read around line 240? Let's find create function again and look for that line. We'll do a quick grep -n "keydown-SPACE".

→ bash {"command":"grep -n \"keydown-SPACE\" index.html"}

toolResult

231: this.input.keyboard.on('keydown-SPACE', jump, this);

assistant

thinking

Now we need to see context: line 231 is within create. Let's replace that line with a comment. We'll edit that line.

Let's read a few lines before and after to ensure exact whitespace. Let's view lines 225-235.

→ bash {"command":"sed -n '225,235p' index.html"}

toolResult

// Camera this.cameras.main.setBounds(0, 0, worldWidth, 600); this.cameras.main.startFollow(player, true, 0.1, 0.1); // Input cursors = this.input.keyboard.createCursorKeys(); this.input.keyboard.on('keydown-SPACE', jump, this); // UI updates updateScore(); updateLives();

assistant

thinking

Now replace that line with maybe nothing (just remove). We'll replace with just a comment. Let's edit:

→ edit

{"edits":[{"newText":"            // Jump is handled in update via cursors.space","oldText":"            this.input.keyboard.on('keydown-SPA

toolResult

Successfully replaced 1 block(s) in index.html.

assistant

thinking

Now we need to also remove the jump function if not used elsewhere. Actually we still call jump from the removed listener, but we can keep it for completeness. Let's keep it.

Now we should also adjust the camera follow smoothing to be tighter. The parameters are (player, true, 0.1, 0.1). That's fine.

Now we need to ensure that enemies bounce off each other? Not necessary.

Now we should test the game by opening it in a browser. Since we are in a headless environment, we can simulate using node with jsdom? Might be heavy. Instead we can check for any syntax errors by running a quick node -c on the script part? We'll extract the script and run with node's syntax check? But we have Phaser global.

Better to just open the HTML with a headless browser like puppeteer? That would be extra. However we can at least verify that the HTML is valid and there are no obvious JavaScript errors.

Let's create a quick test by launching a simple HTTP server and using curl to fetch the page, but that won't run JS. We'll just trust our changes.

Now we need to add some polish: maybe add a simple parallax background using procedural graphics (sky, clouds). Let's add a few clouds (white circles) in the background that scroll slower than camera for parallax effect.

We'll add a layer of clouds created in create function, using graphics, and set scrollFactor to 0.5.

Let's edit the create function to add clouds. We'll do after camera setup. We'll create a group of clouds with random positions.

Let's find the camera lines and add after them. We'll edit the create function again. Let's locate the line "// Camera" and the two lines after. We'll add clouds after startFollow.

Let's read lines 223-235 again after previous edit. Let's get exact lines. Let's view lines 220-240.

→ bash {"command":"sed -n '220,245p' index.html"}

toolResult

this.physics.add.collider(enemies, platforms); this.physics.add.overlap(player, enemies, stompEnemy, null, this); this.physics.add.overlap(player, coins, collectCoin, null, this); this.physics.add.overlap(player, flag, reachFlag, null, this); // Camera this.cameras.main.setBounds(0, 0, worldWidth, 600); this.cameras.main.startFollow(player, true, 0.1, 0.1); // Input cursors = this.input.keyboard.createCursorKeys(); // Jump is handled in update via cursors.space // UI updates updateScore(); updateLives(); } function update() { if (gameOver) return; // Player movement const speed = 300; if (cursors.left.isDown) { player.setVelocityX(-speed); player.scaleX = -1;

assistant

thinking

Now we need to add clouds before the Input section. Let's replace from "            // Camera" line to before "            // Input". We'll add clouds generation.

We'll write a function generateClouds(scene) but we can just inline.

Let's edit the block from line 225 to line 232 (the line before Input). We'll replace those lines with added clouds.

We'll keep the camera lines and add after startFollow.

Let's write new block:

→ edit

{"edits":[{"newText":"            // Camera\n            this.cameras.main.setBounds(0, 0, worldWidth, 600);\n            this.cameras.main.

toolResult

Successfully replaced 1 block(s) in index.html.

assistant

thinking

Great. Now we should also add a simple sky gradient? Could just keep the CSS gradient but we could also draw a gradient in canvas. However we already have CSS gradient on body, but the game canvas is opaque. We can set background color of the game to sky blue. In config we can set backgroundColor. Let's add backgroundColor: '#87CEEB' in config. That will fill the canvas with sky blue, matching the body gradient.

Let's edit the config object. Find the config lines (around line 120). Let's search for "const config". Let's view lines 115-135.

→ bash {"command":"sed -n '115,135p' index.html"}

toolResult

<button onclick="resetGame()">Play Again</button> </div> <script src="phaser.min.js"></script> <script> // Game configuration const config = { type: Phaser.AUTO, width: 800, height: 600, parent: 'game-container', physics: { default: 'arcade', arcade: { gravity: { y: 800 }, debug: false } }, scene: { preload, create,

assistant

thinking

We'll add backgroundColor property after height. Let's edit that line. We'll replace the whole config block? Better to just insert a new line. We'll replace from "width: 800," to after height line. Let's get exact lines:

            width: 800,
            height: 600,
            parent: 'game-container',

We'll add backgroundColor after height. Let's edit. We'll replace those three lines with four lines.

Let's do edit:

→ edit

{"edits":[{"newText":"            width: 800,\n            height: 600,\n            backgroundColor: '#87CEEB',\n            parent: 'game-

toolResult

Successfully replaced 1 block(s) in index.html.

assistant

thinking

Now we can also add some sound effects using Web Audio API? The requirement says no external assets, but we can generate procedural sounds with oscillator. Might be complex; we'll skip for now.

Now we need to ensure the game works correctly. Let's run a quick check for any JavaScript errors by using node's eval? Might be risky. Instead we can open the file in a headless browser using a tool like puppeteer that is already installed? Not sure. We'll assume it's fine.

But we can also add some debug logging. However we should also ensure the player's graphics are correctly positioned relative to the sprite. The player's graphics are added as a child with local coordinates offset by half width/height? We set graphics rectangle at (-16, -24) because player body size is 32x48. That's correct.

Now we need to ensure the camera follows smoothly and the world bounds are correct.

Now we can also add some coins that rotate or bounce for visual appeal. We'll add a simple tween to each coin to make them float up and down. Let's add after coin generation in create function. But we need to reference each coin. We'll add a tween in generateCoins that loops.

We'll modify generateCoins to create a tween for each coin that moves y sinusoidally.

Let's find generateCoins function. Look for line numbers after generateEnemies. Let's search:

→ bash {"command":"grep -n \"function generateCoins\" index.html"}

toolResult

326: function generateCoins(scene) {

assistant

thinking

Let's view that function:

→ bash {"command":"sed -n '326,350p' index.html"}

toolResult

function generateCoins(scene) { const coinRadius = 12; for (let i = 0; i < 30; i++) { const x = Phaser.Math.Between(200, worldWidth - 200); const y = Phaser.Math.Between(100, 400); const coin = scene.physics.add.sprite(x, y, null); coin.body.setSize(coinRadius * 2, coinRadius * 2); const color = Phaser.Math.RND.pick(coinColors); const gfx = scene.add.graphics(); gfx.fillStyle(color, 1); gfx.fillCircle(0, 0, coinRadius); // shine gfx.fillStyle(0xFFFFFF, 0.7); gfx.fillCircle(-coinRadius/3, -coinRadius/3, coinRadius/4); coin.add(gfx); coins.add(coin); } } function stompEnemy(player, enemy) { // Check if player is above enemy and falling const playerHalfHeight = player.body.height / 2; const enemyHalfHeight = enemy.body.height / 2; const playerBottom = player.y + playerHalfHeight; const enemyTop = enemy.y - enemyHalfHeight;

assistant

thinking

We'll replace generateCoins with a version that adds a floating animation using tweens. We'll also set the coin to be kinematic (allowGravity false) so they don't fall. Actually they are physics sprites with gravity default? Since we didn't set allowGravity, they will fall. We need to set allowGravity false and immovable true? Actually we want coins to be static collectibles, not affected by gravity. Let's set coin.body.allowGravity = false and maybe set immovable true.

We'll adjust coin creation. Let's replace the whole function.

We'll also add a tween that moves the coin up and down.

Let's write new generateCoins:

→ edit

{"edits":[{"newText":"        function generateCoins(scene) {\n            const coinRadius = 12;\n            for (let i = 0; i < 30; i++)

toolResult

Successfully replaced 1 block(s) in index.html.

assistant

thinking

Now we need to ensure coins still collide with player (overlap). Since we set immovable true, overlap should still work.

Now we also need to ensure enemies don't get stuck on each other; they can overlap. That's fine.

Now we should add some particle effects when stomping enemy or collecting coin. We can create simple graphic particles using circles that fade out. We'll add a function for explosion.

But we can keep it simple for now.

Now we need to test the game. Let's create a simple HTTP server and use a headless browser like puppeteer if available. Let's check if node is installed and we can run a quick script. We'll write a small Node script that uses jsdom and Phaser headless? That's too heavy.

Instead we can just open the file in a browser locally (but we are in a remote environment). We'll assume the game works.

Now we should also add a restart function that properly resets the game state. Currently resetGame calls game.scene.scenes[0].scene.restart(). That should work.

Now final step: ensure there are no syntax errors. Let's run a quick check using node -c on the script part. We'll extract the script content and run through node's syntax check ignoring undefined variables. We'll do a simple grep for script content and pipe to node -c.

Let's first extract the script block (from `<script>` to `</script>`). Use sed. We'll write a temporary file. Let's do it with bash. Let's create a temporary JS file that contains the script content (without the script tags). We'll remove the first line which is `<script src=\"phaser.min.js\"></script>` and keep the rest.

We'll use awk to extract between the script tags after the first script tag. Let's do a simpler approach: we'll just check the whole HTML with tidy? Not needed.

Let's just run a quick node syntax check on the inline script. Let's write a small Node script that uses vm module to parse the script. But we can also use `node -e 'eval(...)'`. Might be heavy.

Given time, we'll assume the code works. However we should at least verify that there are no missing parentheses or brackets.

Let's do a quick count of braces in the script. We'll write a small Python script? Let's use bash to count opening and closing braces. We'll do a quick check by using grep -o.

But we can also just open the file in a browser using a headless tool that is already installed? Let's see if we have xvfb and chromium installed. Let's check:

→ bash {"command":"which xvfb-run"}

toolResult

(no output) Command exited with code 1

TAKE IT TO CODE

A single self-contained HTML file — copy it and open in any browser, or reuse the prompt with your own pi-agent run.

RUN

modeldeepseek-v3.1-terminus

vendorDeepSeek

harnesspi-agent

generated2026-08-01

EVALUATION

★★★★★ 1/5 broken

Canvas stays completely black throughout due to a JS error (ground.add is not a function); only UI overlay text visible.

off-prompt

Vision grade · anthropic/claude-sonnet-5

MEASUREMENTS

Raw readings from the capture, not a verdict — the grade above is the only judgement. Percentages are how much of the screen changed; the measure under-reports sparse motion on a dark background.

idle motion0.0%

on click0.0%

on drag0.0%

on wheel0.0%

on enter + space0.0%

on arrow keys0.0%

on w/a/s/d0.0%

frame spread107.1 / 255

console errors0

js errors

ground.add is not a function

METRICS

runtime600.1s

tokens in381k

tokens out12k

cached286k

cost / run$0.0765