EveryMemoryLights Out
Tap a tile and it flips itself plus its four neighbours - your job is to switch every light off. A free Lights Out puzzle that trains logical planning. Play it right here.
⚡ Quick answer
Lights Out is a logic puzzle on a 5x5 grid where tapping a tile toggles it and its four neighbours, and you win by turning every light off. It trains logical planning and the ability to think a few moves ahead, because each move ripples outward. Our boards are always solvable, and the honest score is your move count against your own previous best - no rankings.
Key takeaways
- Tap a tile to flip it and its four neighbours; turn every light off to win.
- Every board is generated from a solved state, so a solution always exists.
- Trains forward planning and deductive logic - thinking a few moves ahead.
- Beat your own fewest-moves best; there's no universal 'good' score.
Lights Out is a deceptively simple grid puzzle: tap any tile and it flips not only itself but its four orthogonal neighbours, on to off or off to on. The goal is to get the whole board dark. It looks trivial and then suddenly isn't - every tap you make undoes part of what you just did.
Play the puzzle above (every board is generated to be solvable), then read on for how to think about it and what it actually exercises.
How to play
Each puzzle starts with some lights on and is guaranteed to be solvable.
- Tap New puzzle to generate a board.
- Tap any tile - it flips itself and the tiles directly above, below, left and right.
- Keep going until every light is off.
- Fewer moves is better; your fewest-moves best is saved on your device.
It all runs in your browser - no sign-up, nothing sent anywhere.
What it trains
Lights Out is a tidy little logic workout:
- Forward planning - anticipating how one tap changes its neighbourhood.
- Deductive reasoning - working out which presses must happen.
- Patience and error-checking - undoing dead ends without frustration.
Like any single puzzle, it mostly makes you better at itself and similar logic puzzles - fun practice, not a way to raise general intelligence.
A trick that always works
There's a famous solving method called 'chasing the lights'. Working top to bottom, whenever a light is on, press the tile directly below it - that turns it off. Repeat row by row until you reach the bottom; the lights left on in the final row tell you (via a fixed lookup) which tiles in the very top row to press first, after which one more chase clears the board.
You don't need the lookup to enjoy the puzzle, but knowing that a systematic method exists is a nice reminder that 'feels random' and 'is random' aren't the same thing.
The honest way to read your score
The only fair comparison is your move count against your own past solves. There's no universal 'good' number - different starting boards need different minimums.
If you like this kind of logic, try sudoku, and for a repeatable self-check use the memory test online.
⚠ When to talk to a professional
This is a non-medical logic puzzle for fun and practice, not a test of intelligence or brain health. Puzzle performance varies with practice and familiarity. If you're worried about a real, persistent change in your thinking, speak with a qualified healthcare professional rather than reading anything into a game score.
