jackal858, I have simple 1 Kohm pull-down resistor for each button, and it work properly with a simple test code (when I press the button the corrispective led turn ON).
The game works, but only with LED1, I explain:
-the led1 flash 1 time, I press switch11 time, then the led1 flash 2 times, so I press the switch 1 2 times, and more to the infinite... 
The game works properly buth with just une led, if i press another button the corrispective led turn it on and the game give me error end retes him.
This makes me crazy, this evening I'll try to add some pull-down resistor. Thanks all for now and excuse me for my scary english 