NES - Duck Hunt!! I know they have a duck hunt like game on Wii Play, but I'd pay $5 without a doubt for the original!!

SNES - Pilotwings. Who doesn't remember when you finally made it to the night helicopter mission?

N64 - Snowboard Kids. Throw Mario Kart and 1080 together and this is what you get, one of the funnest games ever. That or Super Smash Bros.

Sega - Mortal Combat 2