Back to the Future

Q: How many guys do I have to kill off in the cafe?
A: You have to knock down at least fifty by throwing milkshakes at them 
   before they overrun you at the soda fountain. If you knock down 100, you
   complete the stage.

Q: What do I do in the school?
A: Oh no! Lorraine's fallen in love with you and is throwing hearts at you
   in a touching gesture of commitment! now you get to.. block every single
   freaking one of those hearts..!!!! If you block at least 100 hears before
   one hits you, you complete the stage.

Q: WHat do I do in the dance-hall?
A: You're part of the band and yer trying to keep up with the music being
   played. So, block the approaching musical notes with your guitar, and the
   "love meter" (tm) rises. When it hits the top, George and Lorraine kiss
   and the stage is over.

Q: Oh no! I finished that bit and now I'm driving this like car down the
   road! Hurry up and tell me what to do before I die!
A: Chill out, sir. Maintain 88 mph while avoiding the lightning. There's a
   wire at the end of the street; touch it as the lightning strikes the 
   clock tower, and you will win the game!

   (ok, so maybe it's not _that_ easy, but..)