1989-91 MS-DOS computer game series. Created by John Carmack and ID software. Played today in the DosBox emulator. Reached its apotheosis with NETKEEN. [[File:Keen_thumbs_basic.jpeg|360px|thumb|right|Commander Keen]

List of official Commander Keen games

Invasion of the Vorticons

• Commander Keen 1: Marooned on Mars
• Commander Keen 2: The Earth Explodes
• Commander Keen 3: Keen Must Die!
• Commander Keen: Keen Dreams

Goodbye Galaxy

• Commander Keen 4: Secret of the Oracle
• Commander Keen 5: The Armageddon Machine
• Commander Keen 6: Aliens Ate My Babysitter!

List of unofficial versions

• Lego keen
• Commander Keen 7 The Keys of Krodacia
• Commander Keen 8 Dead in the Desert
• Commander Keen 9 Battle of the Brains
• Commander Keen 9.5 The Eight Accumulators
• Commander Keen 10 Mirror Menace
• Short Circuit Oracle
• Terror from Outer Space
• NETKEEN

Unofficial Levelpacks from BadBloog

• Levelpack BB1 for Keen1