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Lights Out

Turn off all the lights by toggling cells and their neighbors!

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Frequently Asked Questions about Lights Out

How do you play Lights Out?
Click or tap any cell on the grid to toggle it and its neighboring cells (up, down, left, right) on or off. Your goal is to turn all the lights off. It requires logical thinking because each click affects multiple cells.
Is Lights Out free to play?
Yes, this version is completely free. No downloads, no accounts, no ads blocking gameplay. Play as many rounds as you like in your browser.
Is there always a solution to Lights Out?
Not every random starting configuration is solvable, but the puzzles in this game are generated to always have a valid solution. The challenge is finding the right sequence of clicks to reach it.
What is the best strategy for Lights Out?
A common approach is to work row by row from the top. Turn off all lights in the first row by clicking cells in the second row, then repeat downward. When you reach the bottom row, adjust your starting moves if needed.
What is the history of the Lights Out puzzle?
Lights Out was originally released as an electronic handheld game by Tiger Electronics in 1995. The puzzle is based on mathematical concepts from linear algebra over the field GF(2). It has been a popular logic puzzle ever since.

About Lights Out

Lights Out is a classic electronic puzzle that originated as a handheld game by Tiger Electronics in 1995. The board is a grid of lights that are either on or off, and clicking any light toggles it along with its immediate neighbors above, below, left, and right. Your goal is to turn off every single light on the board. What seems simple quickly becomes a brain-twisting logic challenge, as toggling one light always affects its neighbors. The puzzle has a mathematical foundation rooted in linear algebra over binary fields, and every solvable configuration has an optimal solution. Multiple grid sizes scale the difficulty, and a move counter encourages you to find the most efficient solution. Lights Out is a timeless puzzle that rewards methodical thinking.

How to Play

  1. Click any lit cell to toggle it and its four adjacent neighbors between on and off states
  2. Plan your clicks carefully since each toggle affects up to five cells simultaneously
  3. Work methodically from the top row down, using the bottom row to fix remaining lit cells
  4. Turn off every light on the grid to solve the puzzle, ideally in the fewest clicks possible