Powerpuff Girls: Chemical X-Traction Chemical X-Traction features two modes of play: the main Story Mode, which is one-player only and involves fighting the characters in succession until victorious, and the Simulator Mode, which can be played with one or two players. Adjustable options include round length, number of rounds per fight, and difficulty level (easy, medium, or hard). Progress during the Story Mode can be resumed at a later time by entering a password awarded at the end of each battle.