LeapFrog Leapster Game: Sonic X

Hone your math skills while you help Sonic save his friends from the clutches of evil Dr. Eggman and his robots. Jump, run, spin-dash and soar through different zones as you count, add and subtract. Advance by answering math problems in this fast-paced spinning game. Your efforts are rewarded with gold rings to rescue Amy Rose and Knuckles.
All Leapster games work with all Leapster Learning Game Systems (Leapster, Leapster L-Max and Leapster TV).
Learning skills:

• Sequencing

Infants understand sequence in terms of time. By 18 months, some toddlers can recite number names in order, and some develop the ability to count things by applying number names to items in order.

• Counting to 100

The ability to count to 100 shows that a child can use repeating patterns of 10 to count.

• Skip counting

Skip counting helps children recognize number patterns, a prerequisite to future work in math.

• Addition

Once children know that numbers are symbols for objects (2 stands for two cars) they learn to count sets, or groups of objects, to find sums. Finally, sets of objects can be replaced by numerals and added together in equations.

• Subtraction

The inverse of addition is subtraction - to take away objects and tell how many are left. Once children grasp subtraction, sets of objects can be replaced by numerals in equations.