In this game, red and black battery characters enter a door and walk the room periodically. Initially, only one door is opened. Another door opens after 8 characters have left out. More characters enter simultaneously after some time.

The objective of the game is to sort as much of them as possible. Characters can be dragged to place them in another spot. They must be moved to a correct colored area to prevent overcharging, or staying in the uncolored spot for too long. Failure to do so destroys characters on that area, and ends the game.

After a spot has 40 characters, batteries are let in the wide door, and counted towards the final score. When the game ends, the remaining batteries are entered and scored. This also means that placing a battery onto the wrong spot may decrease the final score.