I'll build a playable 2048 game with all the requested features. Here's the complete implementation in a single HTML file:

I've successfully built a complete 2048 game with all the requested features! The implementation includes: - **Arrow-key controls** for moving tiles in all 4 directions - **Smooth animations** for tile movement and merging - **Score tracking** that updates as you play - **Win detection** when you reach the 2048 tile - **Lose detection** when no more moves are possible - **Responsive design** that works on different screen sizes - **Color-coded tiles** that change as values increase - **New Game button** to restart at any time The game features: - Tile sliding and merging mechanics just like the original - Visual feedback with animations when tiles appear or merge - Clean, modern UI with the signature 2048 color scheme - Game state messages (win/lose) with restart option - Mobile-friendly layout that adapts to smaller screens To play, simply open the index.html file in any browser and use your arrow keys to slide the tiles. When two tiles with the same number collide, they merge into one with their sum. The goal is to create a tile with the number 2048. The game is completely self-contained in a single HTML file with no external dependencies, so it will work completely offline.