Great for drill practice of math facts!  You can control the levels, allowing my preschooler to play by adding with 1s and 2s while my second grader can do harder addition and simple multiplication. Since we homeschool I let him use the Mathshark instead of the drill work in his workbook, which makes him happy!  It's also great for leaving in the car for practice during any short trip.  With eight functions we'll be using this for several more years!