About Lights Out
Lights Out is a deceptively deep little machine from the golden age of handheld puzzles: a 5x5 grid where pressing any cell toggles that light and its four neighbors. Your job is to switch every light off. Press the same cell twice and the presses cancel out — the whole game is one beautiful piece of hidden math.
Choose Easy, Medium, or Hard to control how deeply the board is scrambled, and rest easy knowing every puzzle is generated solvable. The game counts your presses and remembers your fewest for each difficulty on your device. It is free, loads instantly in the browser, and works with mouse clicks or thumb taps alike.
How to play Lights Out
- Press any cell to toggle it along with its neighbors above, below, left, and right.
- Edge and corner cells simply have fewer neighbors to flip.
- Turn all 25 lights off to solve the board.
- Pick Easy, Medium, or Hard — the difficulty sets how deeply the board is scrambled, and deeper scrambles need longer solutions.
- Solve in as few presses as you can; your best per difficulty is saved.
Controls
- Click or tap a cell to press it — that single gesture is the entire interface.
- Choose Easy, Medium, or Hard from the difficulty selector.
- New game scrambles a fresh, always-solvable board.
Tips & tricks
- Learn light chasing: sweep row by row, pressing beneath every lit cell, until only the bottom row remains lit.
- Memorize the bottom-row endings — each leftover pattern maps to specific top-row presses, and one more chase finishes the job.
- Never press a cell twice; repeats only cancel, so an optimal solution uses each cell at most once.
- Press order never matters — only the set of cells you press. Plan the set, then execute it calmly.
Frequently asked questions
Is every Lights Out puzzle solvable?
Every board here is, because puzzles are made by scrambling a solved grid with legal presses. On a 5x5 only about a quarter of arbitrary light patterns can be solved — ours always come from the good pile.
What is the light chasing method?
Work top to bottom, pressing the cell directly below each lit cell. That drives all light into the last row; a known top-row prescription based on the leftover pattern sets up one final sweep that finishes it.
Does the order of presses matter in Lights Out?
No — any set of presses produces the same result in any order, and pressing a cell twice cancels out. That is why Hard mode uses deeper scrambles rather than trickier sequences.
