How to Play
- Tap the board to open the game without making a move.
- Then tap a light to toggle it and its direct neighbors.
- Turn every light off to solve the board.
- Each move changes a small pattern, so plan before you tap.
- Corner and edge moves affect fewer lights, so use them carefully.
- Try a smaller board first, then raise the difficulty.
About Lights Out
Lights Out is a classic switch puzzle built from one simple action: press a cell and the pattern around it changes. The challenge is finding the sequence that turns every light off without chasing the same problem around the board forever.
Free Lights Out Game With No Ads or Download
This Lights Out puzzle opens directly in your browser. There is no app to install, no account to create, no payment, and no ads interrupting the game.
Start on the 4×4 board or choose 5×5, 6×6 or 7×7. Three hints per board highlight a suggested cell; you make the move yourself.
Lights Out Strategy and Tips
What makes Lights Out interesting?
Each move changes several cells at once, so a useful press can also disturb a quiet part of the board. The puzzle becomes a compact lesson in cause and effect: small choices ripple across the grid.
Simple Lights Out strategy
Use light chasing: when a light in a row is on, press the cell directly below it. Work from the top down so later presses do not disturb rows already cleared. See the three-move 4×4 example below, then learn what to check if the last row stays lit.
Good habits for solving the board
- Look for rows or corners that can be settled cleanly.
- Avoid pressing the same light repeatedly unless it is part of a plan.
- Notice how edge cells behave differently from center cells.
- Use the move counter to track an attempt. Different random boards of the same size need not have equally short solutions.
- New Game creates a different pattern; it does not replay your current starting board. After a move, New Game and Difficulty ask before replacing an unfinished puzzle.
FAQ
What is Lights Out?
It is a grid puzzle where the goal is to switch off every light on the board.
What happens when I tap a light?
That light and its direct neighbors toggle between on and off.
Can every board in this game be solved?
Yes. Each new board is generated from legal moves, so it always has at least one solution.
Does this version save my best move count?
Yes. Your best result for each board size is saved in this browser.
Is Lights Out a logic game?
Yes. Lights Out is a classic logic puzzle based on cause and effect, pattern thinking, and grid-based problem solving.
Why do corner moves matter?
Corner lights have fewer neighbors, so corner moves affect fewer cells and can be easier to reason about near the end of a solve.
Light Chasing: A Worked 4×4 Example
A tap toggles its own light and its direct neighbours; it never changes a diagonal or wraps around an edge. To clear a row, press directly below each light that is on. A press in row 2 changes only one cell in row 1, so you can clear row 1 without undoing another cell there. Then repeat for rows 2 and 3.
Here 1 means on and 0 means off. Number rows from top to bottom and columns from left to right. This is an illustration, not the random pattern currently loaded in the game.
Starting board
0 1 0 0 1 1 0 0 1 0 1 1 1 1 1 0
1. Press row 2, column 2. It turns off the light above it in row 1. Row 2 changes too, but you will handle that next.
0 0 0 0 0 0 1 0 1 1 1 1 1 1 1 0
2. Press row 3, column 3. This clears the only remaining light in row 2. Row 1 stays off because this press cannot reach it.
0 0 0 0 0 0 0 0 1 0 0 0 1 1 0 0
3. Press row 4, column 1. This clears the light above it in row 3 and the two lights left in row 4. All 16 lights are now off.
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
What if the Last Row Still Has Lights?
On a larger board, one top-to-bottom pass may leave lights in the bottom row. You cannot press below that row, and pressing it directly can light the row above again. A leftover pattern does not prove the board is unsolvable: all boards generated by this game have a solution.
For example, on a blank 5×5 board, press row 1, column 1, then chase down without any further first-row presses. The last row becomes 0 1 1 0 1, with the other rows off. The position is solvable because it was made using legal presses, even though this pass did not solve it.
For this specific 5×5 position, with only the bottom row 0 1 1 0 1 lit, press row 1, column 1, then chase the lights down again. This clears the board. The same correction is not a universal key for other sizes or bottom-row patterns.
To finish, you need an appropriate pattern of first-row presses followed by another chase, or a solver move. The game’s Hint highlights a suggested cell from a solution for your current board; you still tap it yourself. It does not promise the fewest possible moves. New Game generates a fresh puzzle instead of resetting this attempt.
Two Useful Facts About Presses
Pressing the same cell twice cancels its effect. Also, the order of a fixed set of presses does not change the final pattern. This is why a solution can be described as a set of cells to press once. A solver’s valid set and a shortest set are not necessarily the same.
For the mathematics of the toggle rule, see Wolfram MathWorld’s Lights Out explanation. Return to the puzzle and try chasing one row at a time.
Watch the Whole Pattern, Not Just the Light Count
A useful move can temporarily increase the number of lights that are on. When chasing a row, judge the move by whether it clears the row above, not by whether the whole board immediately looks darker. Keep the rows already cleared out of reach of later presses, and inspect the bottom row after completing the pass.