My two favorites:
Haunted House - Three play levels, plus it plays Bach's Fugure in D Minor as you play. Creepy fun.

Time Machine - As you score, you travel back in time! The game's music and sound effects reflect the era you're in. It's great when you hit the 50s, as there is a built in pinball "chime box" that goes into effect rather than the electronic beeps and whistles for sound effects! Great idea.