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1) Three modes: easy, medium, hard2) Every modes can automatic generated many puzzles3) With memory function, can record state of the game and the highest grades4) "Sleep" function: automatic enter into sleep, states when the work time up tothe 10 minutes, next time you turn on the game you can continue5) Automatic proof answer, press "submit" to examine the answer when finished game,along with displaying right or wrong, and corresponding sound6) Cursor design: in order to look over, the digit has fixed cursor, twinkling cursordisplay. currently position in order to move convenience7) Key sound hint, different key use different sound hint function and mistake operation