Kids will leap ahead in their learning skills with the help of this little cartridge. From LeapFrog, the cartridge works with Turbo Extreme handhelds (sold separately) and covers 4 subjects: social studies, science, math and spelling. The cartridge helps develop hundreds of critical skills kids need to know for fourth grade, including 500 new spelling words, 300 new science and social studies facts and over 130 math skills–plus 2 fun new games, "Beat the Clock" and "Bananza." Not compatible with Turbo Twist handhelds.Imported.