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 2 X 2.5 inch** INCLUDED WITH THE GAME:Stylus, Instruction Manual