2048 — written in Mere

A tiny 2048 compiled from Mere to WebAssembly. The board is drawn as text into a <pre> via dom_set_text, and the arrow keys drive it through dom_on_key — a keyboard binding added to contrib/dom for this game. Turn-based, so no game loop or timer is needed; each keypress runs one move in Mere.

Use the arrow keys to slide tiles. Merge equal tiles to reach 2048. (Click the board first if the keys don't respond.)

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What's happening

1. mere -w g2048.mere lowers the game — a 16-slot vec board, the slide/merge row logic, a tiny LCG for tile spawns — to WebAssembly.
2. dom_on_key registers a global keydown listener; the pressed key name ("ArrowLeft", …) is passed to a Mere closure that applies one move, spawns a tile if the board changed, and redraws the <pre>.
3. No randomness FFI is used: tile spawns come from a pure-Mere linear-congruential generator seeded from a mutable vec slot, so the game is fully self-contained in the Wasm module.