2048 Game Development Prompt: Professional Stable Edition⌗

Objective⌗

Create a high-performance, mobile-optimized 2048 game in a single HTML file. The goal is “Industrial-Grade Smoothness”—zero flicker, state persistence, and polished mobile UX.

1. Visual & Layout Architecture⌗

  • Coordinate System:
    • Tiles MUST use position: absolute.
    • Movement MUST be handled via transform: translate(x, y) using CSS calc().
    • Formula: transform: translate(calc(col * (100% + gap)), calc(row * (100% + gap))).
  • Zero-Flicker Injection:
    • When a new tile is created, its transform coordinates must be calculated and set before it is appended to the DOM to prevent “top-left corner flashing.”
  • Mobile-First CSS:
    • Body: padding-top: 5vh to pull the game down from the notch/status bar.
    • Container: touch-action: none and overflow: hidden to disable browser pull-to-refresh and scrolling.
    • Layout: Center the game board horizontally.

2. Persistence & State Management⌗

  • Auto-Save: After every move and new tile generation, serialize the 4x4 grid (tile values) and current score to localStorage.
  • Session Recovery: On page load, check for saved data. If found, rebuild the grid silently (disable the “appear” animation for recovered tiles) so the player can continue exactly where they left off.
  • Score Tracking: Maintain “Current Score” and a persistent “Best Score.”

3. Core Logic & Animation Sync⌗

  • Atomic Move Sequence:
    1. Calculate: Map out all tile destinations.
    2. Visual Slide: Update transform for all moving tiles (including those marked for deletion).
    3. Delayed Cleanup: Remove merged tiles from the DOM only after the 150ms transition ends.
    4. Merge Pop: Trigger a 1.15x scale pulse on the new tile AFTER the sliding tiles overlap.
  • Animation Lock: Use a lock flag to ignore inputs for 200ms during active animations.
  • Win/Loss Detection:
    • Win: Detect value 2048 and show a “You Win” overlay.
    • Loss: If the grid is full AND no adjacent tiles (horizontal/vertical) match, show a “Game Over” overlay.

4. Interaction & UX Polish⌗

Play the game below or goto this link: