Lights Out
Click a light to toggle it and its up/down/left/right neighbors. Turn every light off to win.
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About this game
Every puzzle here is generated by starting from a fully solved (all-off) board and applying a random sequence of the same toggle move used to play — since toggling a light and its neighbors is its own exact opposite, and the order you toggle in never changes the result, any board reached this way is guaranteed solvable no matter how it looks. That's also how the hint works: this page remembers exactly which cells it toggled to scramble the board, so it always knows a valid next press toward that same solution — turn on Hint to have the next necessary light outlined for you.
Pick 3×3 for a quick warm-up, 5×5 for the classic version, or 7×7 for a real challenge. Your move count is tracked per puzzle, and your best (lowest) move count for each grid size is saved on this device.