💡 Switch Everything Off

The classic lights puzzle, with a twist: the minimum number of moves is computed exactly (Gaussian elimination over GF(2)), so you always know how close to perfect you are.

✨ Features

  • Exact par — solved with linear algebra, not guessing
  • Live 'to go' counter — how far from perfect, in real time
  • 12-step undo plus your own best score per size
  • 3 sizes — 3x3, 4x4 and 5x5
  • Always solvable boards
  • Hints when you get stuck
  • 'Optimal solve' badge when you match the par
  • Original music & sound effects — one-tap mute toggle

🎮 How to play

  • Tap a cell — it and its 4 neighbours flip.
  • Goal: every light off.
  • Try to match the exact minimum number of moves.

Runs in any modern browser — desktop, tablet and phone. No download, no account, progress saved locally.

Part of BrainBox — free brain puzzle games that run in any browser. More puzzles coming soon!

More information
Published 5 days ago
StatusReleased
PlatformsHTML5
Authorbrainboxgames
GenrePuzzle
Tagsbrain, flip, gaussian, lights-out, logic
AI DisclosureAI Assisted, Graphics