The player may use two "rollers" to attack the fish. They are located on two overpasses, one vertical in its orientation, the other horizontal. To use them, the player positions the paintbrush on its forward end, waits for either or both of the fish to approach, then pushes the paintbrush along the roller, attacking the fish. The fish is removed from the maze for a few seconds, then returns to one of the aquariums and resumes its pursuit of the paintbrush. Killing fish in this manner scores bonus points.