Mario-style platformer · qwen3-30b-a3b

Okay, let's tackle this problem. The user wants a side-scrolling platformer using Phaser, all in one HTML file. No external assets, so I need to create everything with Phaser's built-in features.

First, I need to structure the HTML. The script tag for Phaser is already provided, so I'll include that. Then, the style section for basic styling, maybe some centering and a background. The main script will handle the Phaser game configuration.

For the game, I'll set up the scene. The player needs to move left/right, jump. So, I'll create a player sprite with physics. The platforms should be static, and the camera follows the player. 

Collectible coins: I'll create them as sprites, and when the player collides, they get removed and the score increases. Enemies that patrol between two points. When the player lands on them from above, they get destroyed, and the player bounces. If the player hits them from the side, it's a game over.

The goal flag is another sprite. When the player reaches it, the game ends with a win message.

I need to handle the controls. Left/Right arrows or A/D for movement, Space for jump. Display the controls on the screen.

Restart functionality: A button that resets all positions, coins, enemies, and the camera.

Testing the initial movement, jumping, camera follow, and restart. Also, check that collecting coins works and enemies are defeated properly.

Wait, the user mentioned not to use any external assets. So all graphics must be generated with Phaser's graphics API. So, the player, platforms, coins, enemies, and flag need to be created using graphics.

Let me outline the steps:

1. Create the HTML structure with style and script tags.
2. In the script, set up the Phaser game configuration.
3. In the create function:
   - Add the player using graphics (a rectangle or a simple shape).
   - Create platforms as rectangles.
   - Add coins as circles or other shapes.
   - Add enemies as rectangles that move back and forth.
   - Add the goal flag as a rectangle or a simple shape.
   - Set up the camera to follow the player.
   - Display the score and controls.
4. In the update function:
   - Handle player movement and jumping.
   - Check for collisions with platforms, coins, enemies, and the goal.
   - Handle enemy behavior and player-enemy collisions.
5. Implement the restart function to reset all elements.

I need to make sure that all elements are generated with Phaser's graphics. For example, the player could be a blue rectangle, platforms as brown rectangles, coins as yellow circles, enemies as red rectangles, and the flag as a green rectangle.

Also, the camera should follow the player, but stay within the level bounds. So, the camera's scrollX is set to the player's x position, but not beyond the level's edges.

For the restart, when the button is clicked, the game resets the player's position, repositions the camera, resets the coins, and respawns enemies.

Testing: After writing the code, I'll need to check if the player can move, jump, collect coins, defeat enemies, reach the goal, and restart properly. Since I can't actually run it here, I'll have to make sure the code is logically correct.

Potential issues: Collision detection between player and enemies. Making sure that the player can only jump when on a platform. Handling the win and lose states correctly.

I'll start writing the code, making sure all elements are created with graphics and that the physics are set up properly. Also, include the restart button and handle its functionality.

Okay, I need to check if the index.html file I created meets all the user's requirements. Let me go through each part step by step.

First, the user wanted a playable side-scrolling platformer using Phaser. The HTML file includes the Phaser library via a script tag, which is correct. The game is set up with a configuration object, so that's good.

The player is created using a graphics object as a blue rectangle. Platforms are brown rectangles, coins are yellow circles, enemies are red rectangles, and the flag is a green rectangle. All graphics are generated with Phaser's graphics API, so no external assets are used. That's compliant with the requirements.

Controls are displayed with a div saying "Controls: ←→/A/D to move, Space to jump". The restart button is present but initially hidden. The player can move left/right with arrow keys or A/D, and jump with Space. The physics setup includes gravity and platform collision. The camera follows the player, which is handled by the camera's startFollow method.

Collectible coins: When the player overlaps with a coin, it's destroyed and the score increases. The score is displayed and updates correctly. Enemies patrol back and forth. Landing on an enemy from above destroys it and bounces the player, which is handled in the hitEnemy function. Side collisions result in a game over, which triggers the restartGame function.

The goal flag is a rectangle at the end of the level. Touching it shows the "You Win!" message. The restart button resets the game state, including re-creating coins and enemies. The camera resets to the starting position.

I should verify if all the required behaviors are implemented. The player can move, jump, collect coins, defeat enemies, reach the goal, and restart. The camera follows the player within the level bounds. The restart functionality resets all elements properly.

Potential issues: The enemy movement might not be perfectly smooth, but the code uses basic velocity changes. The collision detection between the player and enemies checks if the player is landing on top by checking the velocity y. If the player hits the enemy from the side, it triggers a restart. The win condition is handled by the flag collision.

The code also includes a restart button that appears when the player wins, allowing them to restart the game. The score is tracked and updated correctly.

I think this covers all the requirements. The user can now test the game in a browser, and the code should work as intended.