How to Play
- 1
Click any light to toggle it and its 4 adjacent neighbors (up, down, left, right).
- 2
Turn off ALL lights on the board to win.
- 3
Every puzzle has a solution — think a few steps ahead!
- 4
Choose board sizes from 3×3 (easy) up to 10×10 Oni mode.
ℹ️About This Game
Lights Out is an electronic puzzle game originally released by Tiger Electronics in 1995. The device had a 5×5 grid of lights; pressing any light toggles it and its four orthogonal neighbors. The goal is to turn all lights off. The game attracted serious mathematical interest — it turns out Lights Out puzzles are solvable using linear algebra over GF(2) (binary fields). A dedicated community exists around solving it with the minimum number of button presses, and variants with larger grids remain active areas of recreational mathematics research.
💡Tips & Strategy
- 1
Work row by row from top to bottom: click the cell in the next row that will toggle the light in the previous row.
- 2
After completing rows 1–4, only 5 patterns of row 5 matter — memorize or look up the solutions.
- 3
For small boards, count the "parity" — the total number of lights on. If it's odd, you may need an extra move.
- 4
On harder boards, accept that sometimes clicking a lit cell to retoggle it is the right move.
❓FAQ
Q. Is every Lights Out puzzle solvable?
Not always. About 30% of random starting configurations have no solution. We only generate solvable puzzles for you.
Q. What board sizes are available?
We offer 3×3, 4×4, 5×5, 6×6, 7×7, and a special 10×10 "Oni" mode for extreme challenge.
Q. Why did clicking one light affect others?
That's the core mechanic of Lights Out! Every click toggles 5 cells at once (the clicked cell plus its 4 neighbors), making it a uniquely interesting puzzle.
