Brick breaker · gemma-4-26b-a4b-it

Using the pre-provided phaser.min.js (global Phaser), build a playable brick-breaker game with a paddle (arrow keys or mouse), a bouncing ball, and a wall of breakable bricks with a score. Use ONLY procedurally generated graphics via the Phaser Graphics API or generated textures — no external image or audio assets whatsoever.

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transcript · 8 messages

user

assistant

thinking

The objective is to create a single-page Brick Breaker game using Phaser 3.
    *   Single file: `index.html`.
    *   No external assets (images, audio, CDNs).
    *   Use `phaser.min.js` which is already present in the current directory.
    *   Procedural graphics (Phaser Graphics API or generated textures).
    *   Game elements: Paddle (keyboard/mouse), Bouncing Ball, Bricks (breakable), Score.
    *   Controls: Arrow keys or mouse.

    *   HTML structure: `<!DOCTYPE html><html><head><title>Brick Breaker</title></head><body><script src="phaser.min.js"></script><script>...</script></body></html>`.
    *   Phaser Config: Width, Height, Scene, Physics (Arcade).
    *   Preload: Since I can't use external assets, I'll use `this.make.graphics()` to generate textures for the ball, paddle, and bricks.
    *   Create:
        *   Physics groups for bricks, ball, and paddle.
        *   Initialize ball with velocity.
        *   Initialize paddle.
        *   Initialize bricks in a grid.
        *   Score text.
    *   Update:
        *   Move paddle based on input.
        *   Check for ball/paddle collisions, ball/brick collisions, ball/wall collisions.
        *   Check for ball falling below the paddle (game over).
    *   Logic:
        *   Collision: Ball bounces off paddle and walls.
        *   Collision: Ball hits brick -> brick destroyed, ball bounces, score increases.
        *   Game Over / Win conditions.

    *   *Ball*: Circle texture.
    *   *Paddle*: Rectangle texture.
    *   *Brick*: Rectangle texture (maybe with a slight border or color variation).

    *   Use `arcade` physics.
    *   `checkCollision` and `overlap` or `collider`.
    *   `this.physics.add.collider(ball, bricks, hitBrick, null, this);`
    *   `this.physics.add.collider(ball, paddle, hitPaddle, null, this);`
    *   Ball movement: `ball.setCollideWorldBounds(true);` and `ball.setBounce(1);`.
    *   Note: `setCollideWorldBounds(true)` makes the ball bounce off walls automatically. I need to make sure it doesn't get stuck or something.

    *   *Generate textures*:
        ```javascript
        let graphics = this.make.graphics({ x: 0, y: 0, add: false });
        // Ball
        graphics.fillStyle(0xffffff);
        graphics.fillCircle(10, 10, 10);
        graphics.generateTexture('ball', 20, 20);
        // Paddle
        graphics.clear();
        graphics.fillStyle(0x00ff00);
        graphics.fillRect(0, 0, 100, 20);
        graphics.generateTexture('paddle', 100, 20);
        // Brick
        graphics.clear();
        graphics.fillStyle(0xff0000);
        graphics.fillRect(0, 0, 40, 20);
        graphics.generateTexture('brick', 40, 20);
        ```

    *   *Game Loop*:
        *   `update()`: Handle paddle movement (mouse/keyboard).
        *   `hitBrick(ball, brick)`: Brick dies, score up, bounce ball.
        *   `hitPaddle(ball, paddle)`: Bounce ball, maybe add some angle based on where it hit the paddle.

    *   *Edge cases*:
        *   Ball hitting the side walls: `ball.setCollideWorldBounds(true)` handles this.
        *   Ball hitting top: handled.
        *   Ball hitting bottom: Game Over.

    *   `index.html`
    *   `<script src="phaser.min.js"></script>`
    *   Single script block.

Let's verify `phaser.min.js` exists first.

→ bash {"command":"ls phaser.min.js"}

toolResult

phaser.min.js

assistant

thinking

Okay, `phaser.min.js` is there. Now I will write the `index.html` file.

Game Plan Details:
- Canvas size: 800x600.
- Paddle: Width 100, Height 20.
- Ball: Radius 8.
- Bricks: Rows 5, Cols 8.
- Colors:
    - Paddle: Cyan.
    - Ball: White.
    - Bricks: Various colors (using a simple color palette).
- Scoring: Text at the top.

Refined Collision logic:
Standard Arcade physics bounce might not be enough if the ball hits the edge of the paddle. I'll implement a small adjustment to the ball's velocity depending on where it hits the paddle to make it more "playable".

Let's start writing.

→ write index.html (6477 bytes)

toolResult

Successfully wrote 6477 bytes to index.html

assistant

thinking

The code looks solid. I used `phaser.min.js` as requested. I generated all textures using `this.make.graphics()`. I implemented paddle controls via both keyboard and mouse. I implemented brick collision and scoring. I implemented game over and win conditions.

Let's do a quick sanity check on the physics logic.
- `ball.setCollideWorldBounds(true)` and `ball.setBounce(1, 1)` handles the wall bounces.
- `hitPaddle` modifies velocity based on hit position.
- `hitBrick` destroys the brick and updates score.
- `endGame` handles both victory and defeat.

Wait, I notice one thing:
`brick.setTint(colors[r % colors.length]);`
In Phaser 3, `setTint` works well.

One minor detail:
`const color = win ? 0x00ff00 : 0xff0000;`
`fill: '#' + color.toString(16).padStart(6, '0')`
This is a correct way to convert a number to a hex string.

Let's check the paddle's `setVelocityX`. In `update`, I'm setting velocity. But I also have `paddle.setImmovable(true)`. If it's immovable, it might not respond to `setVelocityX` if it's colliding with something? Actually, `setImmovable(true)` means other things (like the ball) won't move the paddle. But the paddle can still move itself if we set its velocity. However, I am also using `paddle.x = Phaser.Math.Clamp(...)` in the pointermove event.

Actually, if I use `paddle.x = ...` for mouse, I might want to use `paddle.setVelocityX` for keyboard, but `paddle.x` directly overrides the physics engine's movement. It's better to use `paddle.body.setVelocityX` or just handle both via velocity for consistency.

In `update`:
```javascript
            if (cursors.left.isDown) {
                paddle.setVelocityX(-400);
            } else if (cursors.right.isDown) {
                paddle.setVelocityX(400);
            } else {
                paddle.setVelocityX(0);
            }
```
In `pointermove`:
```javascript
            this.input.on('pointermove', (pointer) => {
                if (!gameOver) {
                    paddle.x = Phaser.Math.Clamp(pointer.x, 50, 750);
                }
            });
```
If the user moves the mouse, it will teleport the paddle. If they use keys, it will move it with velocity. This might cause a "jump" if they switch between mouse and keyboard. A better way is to have the mouse control the paddle's target x position or just use velocity for both.

Let's refine the paddle movement to be more consistent. I'll use the mouse to set the paddle's X directly (which is fine for a paddle) and the keyboard to change its velocity. Or even better, just use the mouse to set X and keyboard to offset it. But most people expect mouse to "follow" the cursor.

Actually, if I'm using `paddle.x = ...` in `pointermove`, the `paddle.setVelocityX` in `update` will be fighting with it or being overridden by the next frame's `paddle.x` assignment if the mouse moves.

Let's simplify:
The paddle will follow the mouse/pointer position.
The arrow keys will move the paddle by a certain amount.

Or even simpler:
If mouse is used, follow mouse.
If keys are used, move with velocity.
To avoid conflict, I'll check if the mouse is moving or if keys are pressed. But Phaser's `pointermove` only fires when the mouse moves.

Let's change the logic so the paddle is always moved by velocity, and the mouse/pointer just sets the target velocity or target position.
Actually, the simplest way for a web game:
The paddle's X is always `pointer.x` (clamped) if the pointer is down or moving.
The keys move it.

Actually, I'll just make the paddle follow the pointer if the pointer is "down" or just always follow the pointer's X. And for keyboard, I'll use velocity. To make it smooth, I'll just use `paddle.x` for mouse and `paddle.setVelocityX` for keyboard, but I'll only do one at a time or let them coexist.

Wait, if I use `paddle.x = ...`, physics won't "see" the velocity for collisions in the same way, but `paddle.x` is fine for a paddle.

Let's refine the paddle control to be:
1. If `pointermove` is happening, update `paddle.x`.
2. If `cursors` are used, update `paddle.velocity.x`.

Actually, the most common way is:
```javascript
    function update() {
        if (gameOver) return;

        if (cursors.left.isDown) {
            paddle.setVelocityX(-400);
        } else if (cursors.right.isDown) {
            paddle.setVelocityX(400);
        } else {
            paddle.setVelocityX(0);
        }

        if (this.input.activePointer.isDown) {
            paddle.x = Phaser.Math.Clamp(this.input.activePointer.x, 50, 750);
        }
    }
```
But `isDown` might not be what they want (they might want it to follow even without clicking).
How about:
```javascript
    function update() {
        if (gameOver) return;

        // If mouse is moving, follow it.
        // If keys are pressed, move it.
        // We can prioritize one or just let them both work.
        
        if (cursors.left.isDown) {
            paddle.setVelocityX(-400);
        } else if (cursors.right.isDown) {
            paddle.setVelocityX(400);
        } else {
            paddle.setVelocityX(0);
        }

        // Mouse/Touch control: follow pointer X
        if (this.input.activePointer.isDown || this.input.pointerMove) {
             // This is tricky because pointerMove isn't a property.
        }
    }
```

Actually, I'll just use the simplest version:
```javascript
    function update() {
        if (gameOver) return;

        // Mouse/Touch control: always follow pointer X if pointer is "active"
        // In Phaser, the pointer is always there.
        const pointer = this.input.activePointer;
        
        if (pointer.isDown) {
            paddle.x = Phaser.Math.Clamp(pointer.x, 50, 750);
            paddle.setVelocityX(0);
        } else {
            // Keyboard control
            if (cursors.left.isDown) {
                paddle.setVelocityX(-400);
            } else if (cursors.right.isDown) {
                paddle.setVelocityX(400);
            } else {
                paddle.setVelocityX(0);
            }
        }
    }
```
Actually, many players want to move the paddle with the mouse *without* clicking.
So:
```javascript
    function update() {
        if (gameOver) return;

        // Default: Keyboard
        if (cursors.left.isDown) {
            paddle.setVelocityX(-400);
        } else if (cursors.right.isDown) {
            paddle.setVelocityX(400);
        } else {
            paddle.setVelocityX(0);
        }

        // If mouse/pointer is moving, override/complement
        // Phaser's pointer.x is always updated. 
        // But we don't want the paddle to jump to the mouse if it's on the other side of the screen.
        // Let's just check if the pointer is actually being used.
        // Or simply: if the pointer is within the game bounds and was moved.
    }
```

Actually, I'll just use the `pointermove` event as I did before, and for the keyboard I'll use `setVelocityX`. To avoid the "fighting", I'll check if the mouse is moving. But that's complicated.

Let's go with a simpler, very robust approach:
- Use `paddle.setVelocityX` for both.
- For mouse, calculate the velocity needed to reach the pointer's X.

```javascript
    function update() {
        if (gameOver) return;

        const pointer = this.input.activePointer;

        if (cursors.left.isDown) {
            paddle.setVelocityX(-400);
        } else if (cursors.right.isDown) {
            paddle.setVelocityX(400);
        } else if (pointer.isDown) {
            // Follow pointer with velocity
            const dist = pointer.x - paddle.x;
            if (Math.abs(dist) > 5) {
                paddle.setVelocityX(dist > 0 ? 600 : -600);
            } else {
                paddle.setVelocityX(0);
            }
        } else {
            paddle.setVelocityX(0);
        }
    }
```
Wait, `pointer.isDown` means they have to click. Let's just use `pointer.x` if the pointer is within a certain distance or just use the `pointermove` event to set the position.

Actually, the most common implementation in these tasks is:
Keyboard: arrow keys.
Mouse: follow mouse X.

```javascript
    function update() {
        if (gameOver) return;

        // Keyboard
        if (cursors.left.isDown) {
            paddle.setVelocityX(-400);
        } else if (cursors.right.isDown) {
            paddle.setVelocityX(400);
        } else {
            paddle.setVelocityX(0);
        }

        // Mouse - if the pointer has moved, we set its position
        // To make it feel "natural", if the user moves the mouse, the paddle should follow.
        if (this.input.pointerMove) { // This is not a real thing, I'll use a flag.
        }
    }
```

Let's just use the simplest version that works well:
- The paddle's X is set by the mouse if the mouse is being moved.
- The paddle's velocity is set by the keys.

I'll just use:
```javascript
    this.input.on('pointermove', (pointer) => {
        if (!gameOver) {
            paddle.x = Phaser.Math.Clamp(pointer.x, 50, 750);
        }
    });
```
and 
```javascript
    if (cursors.left.isDown) {
        paddle.setVelocityX(-400);
    } else if (cursors.right.isDown) {
        paddle.setVelocityX(400);
    } else {
        // Only set velocity to 0 if we aren't currently following the mouse
        // But how do we know?
    }
```

Let's just use the most standard Phaser approach for a single-player game:
The paddle follows the mouse. Period.
And the arrow keys also work.

Actually, I'll just use `paddle.x = pointer.x` in `update` if the pointer is within the screen, and if keys are pressed, I'll add/subtract from `paddle.x`.

Wait, I'm overthinking. I'll just provide a clean, playable version. The version I wrote first is actually quite decent. Let's just tweak it slightly so keyboard and mouse don't fight too much.

I'll change the `update` to:
```javascript
        function update() {
            if (gameOver) return;

            // Keyboard control
            if (cursors.left.isDown) {
                paddle.setVelocityX(-400);
            } else if (cursors.right.isDown) {
                paddle.setVelocityX(400);
            } else if (!this.input.activePointer.isDown) {
                // Only stop if the mouse isn't being used
                paddle.setVelocityX(0);
            }

            // Mouse control
            if (this.input.activePointer.isDown) {
                paddle.x = Phaser.Math.Clamp(this.input.activePointer.x, 50, 750);
                paddle.setVelocityX(0);
            }
        }
```
Actually, `isDown` means "click and drag". That's fine.

Let's refine the code one more time in my head.
I'll use:
- Keyboard for movement.
- Mouse movement (without clicking) to move the paddle.

Actually, I'll just use `pointermove` to set the position and `cursors` to set the velocity. If they both happen, the `pointermove` will set the X, and `cursors` will set the velocity. This might cause the paddle to "jitter" but it's acceptable for a simple demo.

Wait, if I set `paddle.x` in `pointermove`, the velocity doesn't matter much because `x` is being overwritten.

Let's go with this:
```javascript
        function update() {
            if (gameOver) return;

            // Keyboard
            if (cursors.left.isDown) {
                paddle.setVelocityX(-400);
            } else if (cursors.right.isDown) {
                paddle.setVelocityX(400);
            } else {
                paddle.setVelocityX(0);
            }

            // Mouse/Touch (follows position)
            if (this.input.activePointer.isDown) {
                paddle.x = Phaser.Math.Clamp(this.input.activePointer.x, 50, 750);
                paddle.setVelocityX(0);
            }
        }
```
Actually, a lot of people expect the paddle to follow the mouse *without* clicking. I'll implement that.

```javascript
        function update() {
            if (gameOver) return;

            // Mouse/Touch control (no click required)
            // We'll check if the pointer is moving or just use its position.
            // To prevent the paddle from jumping to the mouse if it's far away,
            // we only follow the mouse if it's within the game area.
            const pointer = this.input.activePointer;
            if (pointer.isDown || (pointer.x > 0 && pointer.x < 800)) {
                 // But we don't want it to follow if the mouse is just sitting there.
                 // Actually, in many web games, the paddle follows the mouse position.
            }
        }
```

Okay, I'll stick to:
1. Arrow keys move it.
2. Mouse movement moves it.

I'll use the `pointermove` event to update `paddle.x` and the `update` loop for `cursors`.

```javascript
    this.input.on('pointermove', (pointer) => {
        if (!gameOver) {
            paddle.x = Phaser.Math.Clamp(pointer.x, 50, 750);
        }
    });

    // In update:
    if (cursors.left.isDown) {
        paddle.setVelocityX(-400);
    } else if (cursors.right.isDown) {
        paddle.setVelocityX(400);
    } else {
        paddle.setVelocityX(0);
    }
```
If the user moves the mouse, `paddle.x` is set. If they then press a key, `paddle.setVelocityX` is set. This works! The `x` will be updated by `pointermove` and then the physics engine will move it by `velocity` next frame, but `pointermove` will likely fire again or the next `update` will happen. Actually, `paddle.x = ...` will override any velocity-based movement in that frame. That's fine. It's a little bit of a "tug of war" but it's very responsive.

One more thing: `paddle.setImmovable(true)`. This is important so the ball doesn't push the paddle.

Final check on the ball-paddle collision:
```javascript
        function hitPaddle(ball, paddle) {
            const diff = ball.x - paddle.x;
            const angle = (diff / 50) * (Math.PI / 4); 
            
            const currentSpeed = Math.sqrt(ball.body.velocity.x ** 2 + ball.body.velocity.y ** 2);
            const newVX = Math.sin(angle) * currentSpeed;
            const newVY = -Math.cos(angle) * currentSpeed;
            
            ball.setVelocity(newVX, newVY);
        }
```
This looks good. The ball will bounce off the paddle with a direction based on where it hit.

Wait, I should make sure the ball doesn't get stuck inside the paddle.
`ball.setBounce(1, 1)` helps.

Let's re-write the `index.html` with the finalized logic. I'll also add a little "juice" by making the bricks different colors and maybe a dark background.

Actually, I'll just refine the existing one.

```javascript // Final structure of the index.html content I will write ``` Wait, I'll just rewrite the `index.html` with the refined version. <channel|>

→ write index.html (6980 bytes)

toolResult

Successfully wrote 6980 bytes to index.html

assistant

thinking

thought
Actually, I've already written the `index.html`. I'll just double check if there's anything else. The user wants a playable brick-breaker game in a single file. I have done that.

One detail: I used `brick.setTint(colors[r % colors.length]);`. This works with `generateTexture`.

The `bricks.create(x, y, 'brick')` uses the center of the brick as the position for static groups in Phaser 3, so I adjusted `x` and `y` to be the center.

One minor thing: `paddle.setImmovable(true)` is good.

Let's verify the brick position logic:
```javascript
                    const x = offsetLeft + c * (brickWidth + padding) + brickWidth/2;
                    const y = offsetTop + r * (brickHeight + padding) + brickHeight/2;
```
This is correct for placing the center of the brick at the intended grid position.

I'm confident.

The brick-breaker game has been built as a single, self-contained `index.html` file. It uses `phaser.min.js` for the game engine and generates all graphics procedurally via the Phaser Graphics API, meeting all the requirements. ### Features: - **Controls**: Use the **Arrow Keys** to move the paddle or use your **Mouse/Touch** to drag it. - **Gameplay**: Bounce the ball to destroy the wall of colored bricks. - **Scoring**: Gain 10 points for every brick destroyed. - **Graphics**: 100% procedural textures (ball, paddle, and bricks). - **Win/Loss**: Complete the brick wall to win, or let the ball fall past the paddle to lose. To play, simply open the `index.html` file in any modern web browser. **index.html is now present in the current directory.**

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

modelgemma-4-26b-a4b-it

vendorGoogle

harnesspi-agent

generated2026-07-22

EVALUATION

★★★★★ 3/5 working

Functional brick breaker with paddle, ball, bricks, and score; bricks break and score rises steadily over time.

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 motion1.1%

on click2.3%

on drag2.3%

on wheel1.4%

on enter + space1.0%

on arrow keys0.8%

on w/a/s/d1.1%

frame spread19.4 / 255

console errors0

js errors none

METRICS

runtime134.1s

tokens in13k

tokens out9.5k

cached6.3k

cost / run$0.0039