Tilt the mirrors. Route the light. Collect every gem.
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Every board is one puzzle and one shot. Set each mirror, then fire — the light runs its route, and either it takes every gem or it does not. Levels take under two minutes, and the difficulty comes from having to work it out before you fire rather than from anything being fiddly.
An iPhone. There is no sign-up, no email, and nothing to fill in — open it and play. Progress is saved on your device.