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. However, this also means the player can fall to their death accidentally by neglecting to stay inside of lit areas. There are also other objects which the player can interact with, such as hinged spotlights, keys, orb pedestals with various purposes and vines tied to orbs of light. The player has to make use of the light source and light orbs in order to get through the area without falling off the bottom.