The 49th Bit

Default 25×25 board (can be changed down to 4×4).

• Target default set to 10,240,000 (editable in the UI). Note: game uses doubling tiles (2, 4, 8...) so very large targets take many merges — you can set any numeric target.

• Autoplay enabled by default; CPU uses a fast 1-ply simulation + heuristic (empties + max tile) so it keeps moving on huge boards without locking the browser.

• You can take over at any time — player input toggles player control automatically.

• WebAudio: added a synth theme and slide/merge sound effects. Theme schedules in long loops (approx ~25 minutes if left running).

• UI: save/import, simple console, play/stop theme buttons.

A few notes and tips

• 25×25 is compute- and DOM-heavy — the CPU is intentionally lightweight to keep it responsive. If you want a stronger AI for huge boards I can add a separate webworker-based deeper engine, but that will be noticeably slower.

• The numeric target you asked for (10,240,000) is accepted; the merging rules double tiles — hitting that exact number may require many merges and a large board — it’s doable but patience (and autoplay) helps.

• The theme & FX are synthesized — if you want proper MIDI-file playback instead I can embed a base64-encoded MIDI and a JS MIDI player, or add sampled sound effects (WAV/OGG) into the ZIP.