Lights Out · Puzzles · Almost Obvious

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DifficultyEasy

6–8 lights · 2–3 presses at best

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Turn every light off. Pressing a light flips that light and every light joined directly to it. Amber lights are on; hollow lights are off.

Hover or focus to preview a move. Use the arrow keys to move between lights, then Enter or Space to press.

A hint marks one useful light. Press it, or tap the check mark to use the hint.

Each difficulty has 1,000 numbered puzzles. Shuffle and Next puzzle choose an unsolved puzzle. Tap the puzzle number to revisit any puzzle, including one you have solved.

Lines that cross make no extra connections. Every puzzle has a solution.

Explore the mathematics

Turn out the lights

One press flips a light and its neighbors. Turn them all off.

Open loop · 6 lights

On now: Turn every light off
Pressed: 0 presses
Shortest route: 2 presses

0 / 1000 solved

Puzzle 1 / 1000

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Nine numbered lights connected by lines in an irregular network.