Play Lights Out puzzle game free in your browser. Toggle grid lights to turn them all off in the fewest moves. Classic brain teaser with no download required.
Lights Out is played on a grid of lights, each either on or off. Clicking any light toggles it and all of its direct neighbors, horizontally and vertically. The objective is to turn every light off. The challenge is that every click affects multiple cells at once, so naive trial and error quickly loops without progress. The grid is typically 5x5, but variants exist in different sizes.
Every Lights Out puzzle can be analyzed using linear algebra over a two-element field. Each button press is either applied zero or one times, and the effects combine modulo 2. This means there exists a systematic solution for any solvable starting configuration. A practical shortcut is the chase-the-lights method: work row by row, toggling the cell below any lit light in the current row, then handle the bottom row with known patterns. Memorizing a small number of bottom-row templates handles the cleanup.
Lights Out was popularized by a physical toy released by Tiger Electronics in 1995 and became a minor cultural touchstone of 1990s puzzle gaming in the United States. Its browser version strips away the tactile buttons but keeps the core satisfaction of watching the grid go dark. Sessions are brief, making it ideal for short breaks. Because starting configurations vary, no two runs feel identical even though the underlying logic stays consistent.
This version ships five fixed levels that grow harder as the starting scramble deepens, from three initial toggles up to twelve. Because each level is generated by applying random presses to a blank board, every puzzle here is guaranteed solvable. A move counter tracks each click, so the secondary challenge after simply clearing the grid is repeating a level with fewer presses. Pressing the same cell twice always cancels out, returning the board to its prior state, which means any winning path can be reordered freely without changing the result. Use the Next Level button to advance once the grid goes dark, or restart the current level to chase a lower move count. Since cell order never matters, planning your full set of presses before clicking, rather than reacting cell by cell, is what trims wasted moves.
The most frequent error is clicking lit cells directly, hoping they switch off. Because each press also flips the four orthogonal neighbors, attacking a single light usually relights cells you already cleared. Another trap is working bottom-to-top: the chase-the-lights method only functions when you push leftover lights downward, row by row, so always start from the top row. Players also forget that the board has no diagonal effect here, only up, down, left, and right neighbors flip, so corner cells toggle just three cells, not five. Finally, do not panic when the bottom row looks chaotic after chasing; that pattern is expected and is resolved by pressing specific top-row cells, not by more bottom-row clicking. Counting on luck instead of a systematic top-down sweep is what causes the move counter to balloon.
Yes. Each level is built by starting from an all-off board and applying random valid presses, so a solution always exists by reversing those presses. You will never be handed an impossible arrangement, unlike some randomly seeded versions elsewhere.
No. Toggling is commutative, so clicking cell A then B gives the same board as B then A. Only the set of cells you press matters, and pressing any cell an even number of times cancels out entirely, leaving the grid unchanged.
Work top to bottom: for every lit cell in a row, press the cell directly beneath it. This pushes all lights into the bottom row, which you then clear using a handful of memorized top-row press patterns. It guarantees a solution without algebra.
A center press flips five cells, itself plus four neighbors. A corner has only two orthogonal neighbors, so it flips just three cells. Edge cells flip four. Fewer affected neighbors makes corners useful for fine-tuning a nearly solved board.
Yes. Restart the same level and plan the complete set of presses before clicking, since order is irrelevant. The minimum solution for any board uses each cell at most once, so eliminating duplicate presses is the main way to shrink your total.