2048 · gemma-4-31b-it
Build a playable 2048 game with arrow-key tile sliding and merging, smooth animations, a score, and win and lose states.
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Build a playable 2048 game with arrow-key tile sliding and merging, smooth animations, a score, and win and lose states.
thinking
The objective is to build a fully functional, single-file 2048 game (`index.html`).
- 2048 game logic: sliding, merging, spawning tiles.
- Controls: Arrow keys.
- Features: Smooth animations, score tracking, win/lose states.
- Constraints: Single file, no external resources (CSS/JS inline), no network requests.
- HTML: A container for the game board, a score display, and a message overlay for win/lose.
- CSS: Grid layout for the board, styling for tiles based on their value (colors), transitions for sliding/merging.
- JS:
- Game state: 4x4 grid of numbers.
- Move logic: Handle slides (up, down, left, right), merge identical adjacent numbers.
- Spawning: Randomly add '2' or '4' after each move.
- Input: Keyboard event listeners.
- Rendering: Update the DOM to reflect the current state.
- Win/Lose check: Check if 2048 is reached or if no moves are possible.
- Board: A `div` with a grid of 16 slots.
- Tiles: Individual `div`s that move. To achieve smooth animations, I should probably use absolute positioning or CSS transforms relative to the grid, or simply update the DOM and use CSS transitions if I can manage the positions.
- Actually, a simpler approach for a "single file" without external libraries is to use a CSS grid for the board and dynamic classes for tiles. To get *smooth* sliding, I can use CSS transitions on `transform` if I track the tile's position. However, for a robust implementation in one file, using a "virtual" grid and updating the DOM elements is the most reliable way.
- *Wait*, for truly smooth sliding (like the original 2048), I need to track where a tile moves from and to.
- Simplified approach for this task:
- Use a `div` for the board and `div`s for tiles.
- When moving, calculate the new positions.
- Use CSS `transition: all 0.1s ease-in-out` on the tiles.
- Update the `top`/`left` or `transform` of tiles based on their grid index.
- *Move Left*:
- For each row:
- Filter out zeros.
- Merge adjacent identical numbers.
- Fill remaining with zeros.
- *Move Right*: Similar, but process row in reverse.
- *Move Up/Down*: Same logic, but transpose the grid first or iterate by column.
- Win: Any tile reaches 2048.
- Lose: Board is full and no adjacent tiles are the same (no possible moves).
- Colors:
- 2: #eee4da
- 4: #ede0ca
- 8: #f2b179
- 16: #f5955a
- 32: #f67c5f
- 64: #f65e3b
- 128: #edcf72
- 256: #edcc61
- 512: #edc22e
- 1024: #edc22e (slightly different)
- 2048: #edc22e (glow)
- Background: #bbada0
- Empty cell: #cdc1b4
- I will use a coordinate-based system (row, col) and map it to CSS `transform: translate(col * size, row * size)`. This allows for smooth movement between positions.
- Tile animation: Transition `transform` and `opacity`.
- Merge animation: A small scale-up effect.
- Spawn animation: A small scale-down effect.
- I'll create a `Game` class to encapsulate logic.
- Use `requestAnimationFrame` or simple DOM updates.
- Create the HTML structure.
- Add styles.
- Implement the game logic.
- Bind keys.
- Add the win/lose overlays.
(Self-Correction during drafting)
- To ensure it's strictly "single file", I'll embed everything in `index.html`.
- I need to make sure the keyboard events don't scroll the page (e.g., `event.preventDefault()`).
Let's write the code.index.html (16922 bytes)Successfully wrote 16922 bytes to index.html
thinking
The user wants a playable 2048 game. I have implemented the game in `index.html`. I've included:
- 4x4 grid logic.
- Arrow key controls.
- Tile sliding and merging.
- Score tracking.
- Win/Lose states.
- Smooth CSS transitions for movement.
- Responsiveness for smaller screens.
- No external dependencies.
I should double-check the "rotate grid" logic in my `slide` method.
- For 'left': 0 rotations.
- For 'down': 1 rotation (left -> down -> right -> up). Wait, let's re-verify.
- Rotate 90 deg clockwise: `(r, c) -> (c, size-1-r)`.
- If I rotate 1 time:
- Left becomes Up?
- Let's trace:
- (0,0) -> (0,3)
- (0,1) -> (1,3)
- (0,3) -> (3,3)
- (3,3) -> (3,0)
- A 'left' slide moves things to `c=0`.
- If we rotate once, then slide left, then rotate back 3 times:
- Original direction was 'down'.
- Rotate 1 (clockwise): Left is now Up.
- Slide left (now moving up).
- Rotate 3 (clockwise) = rotate 1 (counter-clockwise).
- This is getting confusing.
Let's use a simpler, more explicit approach for sliding:
- Left: Row-based, filter nulls, merge, pad.
- Right: Row-based, reverse, filter nulls, merge, pad, reverse back.
- Up: Col-based, filter nulls, merge, pad.
- Down: Col-based, reverse, filter nulls, merge, pad, reverse back.
I will rewrite the `slide` method to be more robust and clear.{"edits":[{"newText":" slide(direction) {\n let moved = false;\n const size = this.boardSize;\n Validation failed for tool "edit": - path: must have required properties path Received arguments: { "edits": [ { "newText": " slide(direction) {\n let moved = false;\n const size = this.boardSize;\n let scoreGain = 0;\n\n const moveRow = (row) => {\n let filtered = row.filter(cell => cell !== null);\n let merged = [];\n for (let i = 0; i < filtered.length; i++) {\n if (i < filtered.length - 1 && filtered[i].value === filtered[i+1].value) {\n const newValue = filtered[i].value * 2;\n merged.push({ value: newValue, id: filtered[i].id });\n scoreGain += newValue;\n i++;\n moved = true;\n } else {\n merged.push(filtered[i]);\n }\n }\n while (merged.length < size) merged.push(null);\n return merged;\n };\n\n if (direction === 'left') {\n for (let r = 0; r < size; r++) {\n const oldRow = [...this.grid[r]];\n this.grid[r] = moveRow(this.grid[r]);\n if (JSON.stringify(oldRow) !== JSON.stringify(this.grid[r])) moved = true;\n }\n } else if (direction === 'right') {\n for (let r = 0; r < size; r++) {\n const oldRow = [...this.grid[r]];\n const reversed = [...this.grid[r]].reverse();\n const movedRow = moveRow(reversed).reverse();\n this.grid[r] = movedRow;\n if (JSON.stringify(oldRow) !== JSON.stringify(this.grid[r])) moved = true;\n }\n } else if (direction === 'up') {\n for (let c = 0; c < size; c++) {\n const col = [];\n for (let r = 0; r < size; r++) col.push(this.grid[r][c]);\n const movedCol = moveRow(col);\n for (let r = 0; r < size; r++) {\n if (this.grid[r][c]?.id !== movedCol[r]?.id) moved = true;\n this.grid[r][c] = movedCol[r];\n }\n }\n } else if (direction === 'down') {\n for (let c = 0; c < size; c++) {\n const col = [];\n for (let r = 0; r < size; r++) col.push(this.grid[r][c]);\n const reversed = col.reverse();\n const movedCol = moveRow(reversed).reverse();\n for (let r = 0; r < size; r++) {\n if (this.grid[r][c]?.id !== movedCol[r]?.id) moved = true;\n this.grid[r][c] = movedCol[r];\n }\n }\n }\n\n this.updateScore(scoreGain);\n return moved;\n }", "oldText": " slide(direction) {\n let moved = false;\n const size = this.boardSize;\n\n const getVal = (r, c) => this.grid[r][c];\n const setVal = (r, c, val) => { this.grid[r][c] = val; };\n\n const rotateGrid = (grid) => {\n const newGrid = Array(size).fill().map(() => Array(size).fill(null));\n for (let r = 0; r < size; r++) {\n for (let c = 0; c < size; c++) {\n newGrid[c][size - 1 - r] = grid[r][c];\n }\n }\n return newGrid;\n };\n\n // We normalize all moves to a \"left slide\" by rotating the grid\n let iterations = 0;\n if (direction === 'up') iterations = 3;\n else if (direction === 'right') iterations = 2;\n else if (direction === 'down') iterations = 1;\n\n for (let i = 0; i < iterations; i++) {\n this.grid = rotateGrid(this.grid);\n }\n\n // Perform left slide\n for (let r = 0; r < size; r++) {\n let row = this.grid[r].filter(cell => cell !== null);\n for (let i = 0; i < row.length - 1; i++) {\n if (row[i].value === row[i+1].value) {\n row[i].value *= 2;\n this.updateScore(row[i].value);\n row[i].merged = true;\n row.splice(i + 1, 1);\n moved = true;\n }\n }\n \n const newRow = row.concat(Array(size - row.length).fill(null));\n for (let c = 0; c < size; c++) {\n if (this.grid[r][c]?.id !== newRow[c]?.id) {\n moved = true;\n }\n this.grid[r][c] = newRow[c];\n }\n }\n\n // Rotate back\n for (let i = 0; i < (4 - iterations) % 4; i++) {\n this.grid = rotateGrid(this.grid);\n }\n\n return moved;\n }" } ] }
TAKE IT TO CODE
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