1. Replay earlier levels to try out and practice new tricks and combinations. 2. Your best score, along with your current score multiplier, is automatically saved at each check point. Replay the same levels and reach a higher score for that check point, and your older score is automatically replaced. This allows you to use the "best starting position" for any game. It also allows you to replay earlier levels to improve your starting positions for later check points. 5. Power balls (as well as chain reactions) can be used to create vertical four, and even five-in-a- rows.