Sudoku Electronic Game

Function descriptions:
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 LED back light function,intelligentize control.with manual or automatic 
    option (alternative) 
4) "LEEP"unction:automatic enter into sleep state when the work time up to 
    10mintes, when you turnon the game next time it would continue
5) Automatic proof answer,press"UBMIT"o examine the answer when finished 
    game along with displaying right of wrong ,and corres-ponding sound as well
6) Touch design: big screen LCD display,suitable for day and night(need to turn 
    on the LED backlight)
7) Key sound hint, different key use different sound hint function and prevent 
    mistake from operation