Leap Frog Turbo Twist Math with COMPLETE Cartridge Set for Grades 1 - 6 Turbo Twist Math Bundle from Leap Frog. Includes: Complete 3 Cartridge Set for Grades 1-6 Putting a new twist on a tricky subject, the Turbo Twist Math handheld plays fast-paced games that keep kids engaged while they learn. Music, animations and sound effects add to the fun. Adjusts automatically to each player's skill level. Includes a volume control and an automatic shutoff.