Find the fault. Fix the light.
Every board is a small circuit of colored lamps. Tap a lamp and it changes, along with its neighbors. Your goal is to match the target pattern within the move limit. But some circuits have a fault, and no amount of tapping will fix a broken one. You'll need to think like an electrician.
Read the meters to see where the circuit misbehaves.
Probe suspects to narrow the fault down to one spot.
Cut a wire, add a jumper or burn out a bad lamp. Repairs are limited, so get it right.
Light the board in as few moves as you can.
The lessons and the first chapter are free. One purchase unlocks the full game, forever. Every level can always be finished without buying anything: Retry is always free, and each level comes with the repairs it needs. Optional packs of hints, repair kits and extra moves are there if you want them, but stars and leaderboard ranks can never be bought.
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