Blackout is a match game in which the objective is to connect chains of subterranean crystals to clear a path of liquid energy that lights the city. Players match colored crystals, which are then shattered by adjacent detonators. The ground beneath the crystals is cleared under any piece that is destroyed. The light of liquid energy then flows through the path. Players are kept on their toes by the encroaching darkness that slowly consumes the map. Move quickly to avoid the darkness and go for the high score.