Lights Out Open-source
Turn every light off on the grid — but each press also flips its neighbours, so the obvious move is rarely the right one. Small boards make the mathematics visible: you can literally watch a strategy work. A perfect pocket deduction puzzle with rounds short enough to restart without grief.
Loads the game from our own servers after you choose Play. Nothing loads before that.
Scores are kept on this device only. Enable personalization to track your personal best.
How to play
Click or tap a cell to toggle it and its neighbours. Keyboard: arrow keys to move, Enter to press.
On/off state is shown by both colour and glyph, never colour alone. Keyboard playable. No timers, no sound.
Facts
| Estimated play time | 5 minutes |
|---|---|
| Difficulty | Easy |
| Devices | Desktop and mobile |
| Orientation | Portrait or landscape |
| Language | English |
| Audience | General, 16+ (no children-directed content) |
| Content notes | None recorded |
| License status | Approved |
| Review status | Approved |
| Last review | 2026-08-29 by agent-technical-qa 2026-08-29 (license file verified, static audit: no trackers/CDNs after font-link removal); Alex hands-on trial requested |
Record pm-104 · imported 2026-08-29 · retest due 2026-09-05