Sell sudoku

1. Three Modes: easy/medium/hard 2. Every modes can automatically generate many puzzles 3. With memory function, which can record the rate of the game and the highest grades 4. LED back light function, intelligentize control, with manual or automatic option Alternative) 5. "SLEEP"function:automatic enter into sleep[ state when the work time up to 10 minutes, when you turn on the game next time it would continue 6. Automatic proof answer, press "SUBMIT" to examine the answer when finished game along with displaying right or wrong, and corresponding sound as well 7. Touch design 8. Big screen LCD display, suitable for day and night (need to turn on the LED backlight) 9. Key sound hint, different key us different sound hint function and prevent mistake from operation