This is a new unopened Sonic The Hedgehog Leapster game cartridge. This cartridge works with all Leapster Learning Systems. For ages K - 1st Grade. It teaches Numbers & Counting: number identification , understanding number values with visual support, counting through 99, identifying missing numbers in a sequence, counting by 2’s, 5’s and 10’s and counting backward from 20, Addition: addition with visual support and addition with numerical equations, Subtraction: subtraction with visual support and subtraction with numerical equations. Help Sonic save his friends from the evil clutches of Dr. Eggman! Race through different worlds as you answer math questions and collect gold rings to rescue Sonic’s friends! Comes from a smoke free home