DESC: Can you and Sonic save his friends from the evil clutches of Dr. Eggman? Jump, run, spin-dash and soar through different zones as you master math skills and collect gold rings Rescue Amy Rose and Knuckles in this fast-paced game that teaches counting, sequencing, addition and subtraction For use with the Leapster Learning Game System (sold separately) For ages 5-6 yrs., Manufacturer: LeapFrog