Overview
Light the bulb — solve the formula! In front of you is a logic circuit of AND, OR, NOT and XOR gates plus the input switches A, B, C... Pick a combination so the output becomes TRUE. The fewer switch flips, the more stars: ★ for a solution, ★★ close to the optimum, ★★★ for the optimum without hints. 100+ hand-crafted levels with growing complexity, a procedurally generated Daily Challenge (deterministic by date — everyone gets the same), hints, undo, achievement tree. A brain workout with no timer and no penalties. Available in 7 languages.
Videos and screenshots
12,835 players online
How to play
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Open the game
Press Play now and the game opens on its own screen.
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Follow the in-game instructions
The controls and goals are shown inside the game as you play.
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Use the game menu
The floating button over the game reloads it, saves it to your favourites, or takes you back out.
