The 1999 applet's game, re-implemented in JavaScript. 115 levels, three skins, unlimited undo. What this is, and where it came from
Move with ← ↑ ↓ →, W A S D or I J K L. U undoes, R restarts, N is the next level. On a phone, swipe the board or use the pad. The level and skin you left on are remembered in this browser.