Dear olisgold, you can count on me if you get stuck, but I would like to see at least one try, because as lester said, it's the best way to learn.

As a little tip, you can expand the game with diferent approaches, one could be with charlieplexed LEDs (controling them with 3 pins) and then use the 3 remaining pins for the buttons (as in the example, using them as analog inputs to read 2 buttons per pin)

Regards.