4-IN-1 HANDHELD ELECTRONIC GAME WITH BACK-LIGHT AND TOUCH SCREEN** KEY FEATURES:• Includes the following four easy but challenging mind games:• SUDOKU• DIGIT BRICK• INSTANT MEMORY• MASTER MIND• Digital touch screen• Large high-contrast LCD screen with soft-white backlight, which is easy on eyes and suitable for day or night use• Demo mode at the beginning of every game - shows how the game is played• User selectable contrast levels and difficulty levels• Each level can automatically generate multiple puzzles• Game automatically enters sleep mode if not used for 3 minutes• Resume function continues game where it wast when the game was turned off or went into sleep mode• Undo function can undo up to last 128 steps• Uses 2 "AAA" batteries (not included)• Display size 52 mm X 63 mm** INCLUDED WITH THE GAME:• Stylus• Instruction Manual