Donkey Kong

Donkey Kong (1981): The first appearance of Jumpman, who would eventually become Mario! 

Galaga

Galaga (1981): The sequel to Galaxian; stop the alien invaders! 

King of Fighters XI

King of Fighters 11 (2005): A fighting game where teams of 3 duke it out to stop Those From the Past!

Metal Slug 3

Metal Slug 3 (2000) A SNK game where the military fight off bad guys, zombies & aliens!

Ms. Pac-Man

Ms. Pac-Man (1982): A Midway game, spinning-off the popular game Pac-Man!

Street Fighter Alpha 2

Street Fighter Alpha 2 (1996): A fighting game to see who's the best of best; beat Akuma, the demon warrior!

Vindicators

Vindicators (1988): An Atari game where tanks shoot monsters and get upgrades!