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.

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