Keen 1: Marooned on Mars

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Keen 1: Marooned on Mars
Keen 1 title.png
Release dateDecember 14, 1990[1]
Secret levels1
Download/buyDownload (v1.31)
(other versions)
Keen 2 »

Keen 1: Marooned on Mars is the first episode in the Invasion of the Vorticons trilogy.

Episode details


The game

Teddy Bear.png

More fun


Behind the scenes

  • Does this episode have any bugs in it?
  • Are there different versions of this episode?
  • How did they develop this episode?

Beyond the norm


These items are found in this episode.

  • Car Battery.png
    Ship part required to finish the game.
  • Everclear.png
    Ship part required to finish the game.
  • Joystick.png
    Ship part required to finish the game.
  • Keycard (Vorticons).png
    Keys used to unlock doors.
  • Pogo Stick.png
    Pogoing allows reaching otherwise inaccessible places.
  • Raygun.png
    Five extra shots.
  • Vacuum Cleaner.png
    Ship part required to finish the game.


The following creatures and hazards are found in this episode.

  • Butler Robot.png
    A nice little Martian robot that has trouble keeping his hat on. He is nice except for the fact that he usually pushes you off a platform to your death.
  • Fire Keen1.png
    Common traps that will burn heroes to death.
  • Garg.png
    A speedy green monster with two eyes on stalks, commonly found creeping out of tunnels.
  • Pat Pat.png
    Almost a kind of plant that opens and closes its "mouth" trying to chomp Keen if he comes too close. Similar to a Venus Fly Trap.
  • Tank Robot.png
    These robots exist to kill any intruders. Even friendly ones.
  • Vorticon.png
    A Vorticon Guard actually. Also appears as a Vorticon Commander.
  • Yorp.png
    A harmless, happy alien.


Fans have modified the Commander Keen games to produce new games. A few recent mods are shown here, but there are 159 mods for this episode.


  1. Release date of Keen: Vorticons v1.0 from