Lights Out
Toggle lights to turn them all off. A deceptively tricky logic puzzle!
About Lights Out
Lights Out is an electronic puzzle game originally released by Tiger Electronics in 1995. The game consists of a 5×5 grid of lights that can be toggled on or off. Pressing a light toggles it and its adjacent neighbors. The puzzle is rooted in linear algebra over GF(2) and has been extensively studied in mathematics.
How to Play
Click on any light in the 5×5 grid. This will toggle that light and its immediate neighbors (up, down, left, right) — lights that are on will turn off, and lights that are off will turn on. Your goal is to turn ALL lights off. Think carefully about each move, as every click affects multiple lights. Solve increasingly difficult patterns as you progress through levels.
Tips & Strategies
- •Work systematically from top to bottom — solve the top row first, then use the row below to fix remaining lit cells.
- •Remember that clicking the same cell twice returns it to its original state — every move is reversible.
- •Corner cells affect only 3 lights, edge cells affect 4, and center cells affect 5 — use this to your advantage.
- •Sometimes the solution requires clicking cells that are already off — don't just focus on lit cells.
- •If stuck, try the 'chase the lights' strategy: work down each row turning off lights using the row below.