Fancy Novelty Keychain Sudoku Number Puzzle Game

Feature: - Three modes: easy, medium, hard - Each mode can automaticallygenerated several puzzles - Built in memory can record game status and hightest scores - LED backlight function intelligent control manful or automatic option - Sleep function automatically enters in to sleep mode after 10minutes without operation - Answer check function will automatically check answers and show the correct ones - Large trans-reflective LCD screen is suitable for both day and night use LEDbacklight to be turned on at night - Different keys have different sounds which help prevent mistakes