2048 · nemotron-3-nano-30b-a3b

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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transcript · 2 messages

user

Build a playable 2048 game with arrow-key tile sliding and merging, smooth animations, a score, and win and lose states.

assistant

thinking

We need to produce a single-page web app in an index.html file, containing CSS and JS inline, no external resources. The game should be playable: arrow-key tile sliding and merging, smooth animations, a score, win and lose states. So we need to generate an index.html file containing HTML structure, style tag with CSS for game layout and animations, and a script tag with JavaScript implementing the 2048 logic.

We need to ensure that it's self-contained, no external dependencies. The environment apparently is a sandbox. We need to produce a file called index.html in the current directory (/tmp/ws). We'll use write command to output the content. The content must be a single file with everything inline.

The user asked: "Build a playable 2048 game with arrow-key tile sliding and merging, smooth animations, a score, and win and lose states."

Thus we need to produce a complete HTML file with JavaScript implementing the game. Should be fairly typical 2048 implementation.

Need to think: Should we include aspects such as: grid of 4x4, tiles with powers of 2, arrow key listeners, move logic, merging, smooth transition animations (maybe using CSS transitions), update score display, detect win/lose etc.

We need to output only the index.html file, and then we are done. The system expects that we use "write" tool to write the file with path "index.html" and content as string.

Make sure no extraneous files.

First, consider the content to be written.

We should generate something like:

```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>2048</title>
<style>
  body { margin:0; display:flex; justify-content:center; align-items:center; height:100vh; background:#eee; }
  #game-container { width: 500px; background:#f0f0f0; padding: 20px; border-radius: 10px; box-shadow: 0 4px 12px rgba(0,0,0,0.2); }
  #grid { display: grid; grid-template: repeat(4, 100px) / repeat(4, 100px); gap: 10px; }
  .tile { width: 100%; height: 100%; line-height: 100px; text-align: center; border-radius: 6px; background:#eee; font-size: 2rem; font-weight: bold; color:#776e66; user-select:none; }
  .tile-2 { background:#eee4da; }
  .tile-4 { background:#ede0c8; }
  .tile-8 { background:#f2b179; color:#fff; }
  .tile-16 { background:#f59563; color:#fff; }
  .tile-32 { background:#f67c5f; color:#fff; }
  .tile-64 { background:#f65e3b; color:#fff; }
  .tile-128 { background:#edcf72; color:#fff; }
  .tile-256 { background:#edcc61; color:#fff; }
  .tile-512 { background:#edc850; color:#fff; }
  .tile-1024 { background:#edc53f; color:#fff; }
  .tile-2048 { background:#edc22e; color:#fff; }
  #score { text-align:center; margin-bottom:10px; font-size:1.2rem; }
  #message { text-align:center; font-size:1.5rem; color:#776e66; }
</style>
</head>
<body>
<div id="game-container">
  <div id="score">Score: <span id="score-value">0</span></div>
  <div id="grid"></div>
  <div id="message"></div>
</div>
<script>
  // 2048 implementation
  const SIZE = 4;
  let board = [];
  let score = 0;
  const gridEl = document.getElementById('grid');
  const scoreEl = document.getElementById('score-value');
  const messageEl = document.getElementById('message');

  // Initialize board
  function init() {
    board = Array(SIZE).fill().map(() => Array(SIZE).fill(0));
    // Add two random tiles
    addRandomTile();
    addRandomTile();
    // Setup grid UI
    render();
  }

  // Add a random tile (2 or 4) at empty position
  function addRandomTile() {
    const empty = [];
    for (let r = 0; r < SIZE; r++) {
      for (let c = 0; c < SIZE; c++) {
        if (board[r][c] === 0) empty.push([r,c]);
      }
    }
    if (empty.length === 0) return;
    const [r,c] = empty[Math.floor(Math.random()*empty.length)];
    board[r][c] = Math.random() < 0.9 ? 2 : 4;
  }

  // Render board tiles
  function render() {
    gridEl.innerHTML = '';
    for (let r = 0; r < SIZE; r++) {
      for (let c = 0; c < SIZE; c++) {
        const tile = document.createElement('div');
        tile.classList.add('tile');
        if (board[r][c] !== 0) {
          tile.textContent = board[r][c];
          tile.classList.add(`tile-${board[r][c]}`);
        }
        gridEl.appendChild(tile);
      }
    }
    scoreEl.textContent = score;
  }

  // Move in a given direction: 0=up, 1=right, 2=down, 3=left
  function move(dir) {
    const moved = moveTile(board, dir);
    if (moved) {
      addRandomTile();
      render();
      if (isGameOver()) {
        messageEl.textContent = 'Game Over!';
      } else if (hasWon()) {
        messageEl.textContent = 'You Win!';
      }
    }
  }

  // Returns true if any tile moved
  function moveTile(board, dir) {
    const moved = {value: false};

    // copy original board to compare later
    const original = board.map(row => row.slice());

    // Process each row/col according to direction
    for (let i = 0; i < SIZE; i++) {
      // Extract non-zero values
      const line = [];
      for (let j = 0; j < SIZE; j++) {
        const idx = getIndex(i, j, dir);
        if (board[idx[0]][idx[1]] !== 0) line.push(board[idx[0]][idx[1]]);
      }

      // Compact and merge
      line = compress(line);
      line = merge(line);
      line = compact(line);

      // Write back to board
      for (let j = 0; j < SIZE; j++) {
        const idx = getIndex(i, j, dir);
        const newVal = line[j] || 0;
        const oldVal = original[idx[0]][idx[1]];
        if (newVal !== oldVal) {
          board[idx[0]][idx[1]] = newVal;
          moved.value = true;
        }
      }
    }
    return moved.value;
  }

  // Utility: based on direction, get coordinates order
  function getIndex(row, col, dir) {
    switch(dir) {
      case 0: return [row, col]; // up
      case 1: return [col, row]; // right? Actually we can reuse transform; easier to handle by transformation matrix; let's restructure.

      // better approach: apply directional transforms using iteration over rows/cols.
    }
    return [row, col];
  }

  // Let's simplify by handling each direction separately without rely on getIndex. Instead we can transform board accordingly.

  // Alternative approach: Use standard algorithm for 2048.

  // Let's rewrite move function with direction parameter mapping to iteration direction.

  // We'll implement a generic slide/compress/merge approach using array utilities.

  // Create helper functions to slide and merge a 1D array.
</parameter>
</function>
</tool_call>

TAKE IT TO CODE

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RUN

modelnemotron-3-nano-30b-a3b

vendorNVIDIA

harnesspi-agent

generated2026-08-01

METRICS

runtime7.8s

tokens in1.7k

tokens out1.8k

cached0

cost / run$0.0005