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All 2K Games 2K Play 3DO 989 Studios ASC Games ASCII Entertainment Absolute Entertainment Acclaim Acclaim Entertainment Acclaim Sports Accolade Acquire Active Enterprises Activision American Laser Games American Sammy Angel Angel Studios Arc System Works Arcade Systems Arcadia Systems Ascii Asmik Atari Atari Corporation Atari Games Atari, Inc. Athena Atlus Axcellerator

All 1158 1st Playable Productions 2K Play 3DO 4J Studios 5th Cell 8ing 989 Studios ADK Acclaim Acclaim Studios Acclaim Studios Austin Acclaim Studios Cheltenham Acclaim Studios Dallas Acclaim Studios Teesside Accolade Acquire Action Game Inc. Active Enterprises Activision Aicom Aiky Aki Corporation Alexey Pajitnov Almanic Alpha Denshi AlphaDream Altron Amaze Entertainment Ambrella