Wikipedia: 1981 in video gaming - MobyGames: Browse 1981 - The International Arcade Museum: 1981
Scramble
Scramble, March 1981@987
Asteroids Deluxe (Arcade)
Bosconian (Namco Galaga)
Centaur (Pinball)
Centipede (Arcade)
Defender (Arcade)
Defender (Atari 2600)
Donkey Kong (Arcade)
Gorf (Arcade)
Laser Blast (Atari 2600)
Mars (Scramble)
Maze Invaders (Arcade)
Ms. Pac-man (Arcade)
Octopus (Custom Handheld)
Tempest (Arcade)
Warlords (Arcade)
Yars' Revenge (Atari 2600)