Customize the learning by choosing from 20 different mathematics skills, then play with your favorite NFL team in 5-on-5 football with the LeapFrog Explorer Learning Game - NFL Rush Zone! The LeapFrog Explorer Learning Game - NFL Rush Zone features: 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. Works with the Leapster Explorer and LeapPad systems ( sold separately ). LeapFrog is a leading designer, developer and marketer of innovative, technology-based educational products and related proprietary content and learning toys and learning games. LeapFrog is 100% focused on developing products that will provide the most engaging, effective learning experience - for all ages, in school or home, around the world. LeapFrog puts learning toys first with online technologies, including the LeapFrog Learning Path. The LeapFrog Learning Path lets you see the skills your child is exploring with LeapFrog, see time spent playing, challenge level and more, find learning ideas to match your child's passions, and discover your child's favorite activities. The LeapFrog learning toy experience is brought to life by LeapFrog's highly specialized teams who unite the three key elements that truly set LeapFrog products apart: a rigorous, proven learning toy methodology, compelling multi-layered content, and delivered content and learning toy experience through the use of technology that is intuitive, invisible and engaging. Leapfrogs Learnings Toys include, Leapster, TAG, TAG Jr., DIDJ, Zippity, My First Leap Pad, Learn and Groove and My Puppy Pal.