is a puzzle platformer of 30 levels with a game mechanic based on light and darkness. The goal for each level is to reach a door. Most of the screen is however shrouded in darkness and the player is only able to view a small part of the area where there are light sources. For the player's character to move around, he has to carry glowing orbs with them, following their path as they move around. By partially lighting an area of the scenery, it is possible to traverse otherwise inaccessible sections. When there is no lit ground below the player's character's feet, he just drops down and the level restarts.
Later levels bring along more difficult combinations of moving orbs, following their path with quick timing, doors that need multiple orbs to be lit properly and keys to open doors. Orbs can be carried or dropped, or put into pedestals. There are also certain areas where dropping is not allowed.