Penumbra

Fire light into a dark box. Read where it leaves. Find the atoms.

BoardClassic

Ray points0

Atoms placed0/4

Deduction game

Penumbra

Atoms hide in an 8 by 8 box. Fire rays from the rim: a ray that meets an atom head-on is absorbed, one that passes beside an atom bends away from it, and one squeezed between two turns back. Every ray costs points. Place your guesses and submit when you are sure.

HHit: an atom sat straight ahead and absorbed the ray. 1 point.

RReflection: the ray came back out where it went in. 1 point.

3Detour: the ray left somewhere else, marked by a matching number. 2 points.

Missed atoms cost 5 each. Lowest score wins.

An atom beside the entry on the rim reflects the ray before it gets in.