Play the fascinating game of Sudoku in a fun hand-held electronic game. Featuring three levels of difficulty and includes sound function, memory function, sleep mode and automatic answer correction to check your answers. The back-lit LED screen is easy to read both day and night. Measures 2-3/4″ wide x 4-3/4″ long x 3/4″ deep. Requires 2 “AA” batteries, not included. Instructions included. Ages 8+.