• Commander Keen, Episodes 1 through 5
• Wolfenstein 3D
• Spear of Destiny
• Return to Castle Wolfenstein
• Ultimate DOOM
• DOOM II
• Final DOOM
• DOOM3
• DOOM3: Resurrection of Evil
• QUAKE
• QUAKE Mission Pack 1: Scourge of Armagon
• QUAKE Mission Pack 2: Dissolution of Eternity
• QUAKE II
• QUAKE II Mission Pack: The Reckoning
• QUAKE II Mission Pack: Ground Zero
• QUAKE III Arena
• QUAKE III: Team Arena
• Heretic
• Heretic: Shadow of the Serpent Riders
• HeXen
• HeXen: Deathkings of the Dark Citadel
• HeXen II
All these games on steam soon!