LeapFrog Explorer Learning Game: NFLRush Zone (works with LeapPad Explorer & Leapster Explorer) Choose the mathematics skills you need to study and download them to your game Improve your team's skill level with each addition or subtraction drill you run Play as any of your favorite 32 NFL teams for the RushZone championship Teaches addition, subtraction and multiplication; Appropriate for children ages 6 to 9 years (grades 1 to 3) Works with all LeapPad learning tablets, LeapsterGS and Leapster Explorer (sold separately); Internet connection may be required for cartridge