Objective

Keep the photon off the floor. Your mirror is the only thing that sends it back up, and every rebound throws it higher and brings it back faster.

Controls

Steer the mirror: drag left or right anywhere on the screen, or use the arrow keys (A and D work too). The mirror eases up to 7 units per second and coasts a little when you let go, so plan the stop as well as the start.

Scoring

A catch is +10, and a catch inside the middle 30% of the mirror is +15. A prism the photon passes through in flight is +5.

The catch

Where the photon lands on the mirror decides where it goes next: an off-centre catch throws it sideways, and it banks off the chamber walls. The net below saves one drop and needs eight seconds to relight — drop the photon again before then and the run ends.