Turbo Twist Leap Frog Spelling. 5 Fun-Filled Game Modes 4AA Batters Required (not included) Automatically adjusts to each player's skill level Expandible with additional Turbo Twist Spelling Cartridges (sold separately and subject to availability) ONLY compatible with Turbo Twist Spelling Cartridges. NOT compatible with Turbo Twist Math, Turbo Extreme or Brain Quest