Free 2048 Game — Single HTML File, No Ads

2048Zip is the classic 2048 sliding-tile puzzle in one self-contained HTML file. Slide tiles with arrow keys, WASD or swipes; equal tiles merge; reach 2048 — then keep playing for a higher score. Score and best score persist in localStorage, a one-step undo forgives misclicks, and the game state auto-saves so you can close the tab mid-run.

The engine is deliberately clean: one pure slideRow function handles merging (with correct no-chain-merge rules), and all four directions are derived from it by rotating the grid — which made it trivial to unit-test outside the browser.

No dependencies, no ads, no tracking. The original 2048 concept by Gabriele Cirulli is MIT-licensed, and so is this. Drop the file on any static host or embed it with an iframe.

1. Unzip. You get one file: index.html.

2. Put it anywhere — a folder on your website, GitHub Pages, Netlify, a USB stick — or just double-click it and play locally.

3. To embed it on an existing page: <iframe src="/2048zip/index.html" style="width:100%;height:800px;border:0"></iframe>

Best scores save automatically in the browser's localStorage.

Paste this prompt into Claude to build this exact product:

Build the classic 2048 sliding puzzle as a SINGLE self-contained HTML file called 2048Zip (inline CSS/JS, no dependencies). Dark theme, amber accent, rounded tiles, works great on phones.

Engine (pure and testable): a slideRow function that slides one row left and merges equal neighbours exactly once per move (2,2,2,2 → 4,4 — no chain merges), returning the new row, points gained and whether anything moved. Derive all four directions from it by rotating the grid. Provide canMove (game-over detection) and addTile (new 2 or 4 — 90/10 — in a random empty cell).

Game: 4×4 grid, score + best score (localStorage), one-step undo (button and U key), win overlay at 2048 with a keep-playing mode, game-over overlay, pop animation on the spawned tile, tile colors scaling with value. Controls: arrows, WASD and swipe. Auto-save the full state and resume on load.

Deliver the single HTML file with an MIT header crediting Gabriele Cirulli's original.

What happened when we ran it: Claude produced the game in 207 lines. We extracted the engine and ran it through 14 Node unit tests — simple and double merges, the no-chain rule, gap sliding, all four directions on an asymmetric grid, score arithmetic and dead-board detection — all passed on the first run. Zero revisions.

Note: there is no demo restriction — the demo IS the full game, and the download is the same single file. The prompt is for reproducing (or remixing) the build yourself with your own Claude subscription.