Closure

Closure is a puzzle/platformer title that centers on the concept of light. Through each of the many levels, the goal is to reach the door at the end. Lighting is a key gameplay mechanic, as only platforms and walls illuminated by lightbulbs, or orbs of light the player can carry can actually be touched by the player. The player can therefore walk through walls or fall through the floor based on where the light is. (wikipedia.org)