Penumbra

Light and color puzzles

Penumbra is a PC puzzle game about directing colored light across a marked floor. You drag Lights around a ring and slide stone Obelisks across the floor, arranging beams and shadows so each goal receives its exact required color.

The goals call for white, a primary color, a mix, or total darkness. Where beams overlap, their colors add: red and green make yellow, while red, green, and blue make white. Obelisks cast shadows that remove light from the floor. Some filter only part of a beam, creating colored shadows rather than blocking all the light.