Wow, shocker. Basically you make the guy walk around and pump up the dragons or whatever until you make them all explode or they run away. But you can't touch them or you die.
http://www.heavygames.com/digdug/showgame.asp
The second one seems more geared towards students anyway. If you're not up and partying then you're up all night studying. :D Obviously if you're not in school good grades mean nothing.