Intruder is a solitaire science fiction microgame published in 1980 by Task Force Games in which a rapidly maturing alien roams a space station, ambushing and killing crew members.
[1] A young alien life form has escaped from the labs of the space station Prometheus, and hunts members of the crew as it matures and gains new abilities, moving randomly each turn.
[1] The game comes with three other scenarios: In 1977, Metagaming Concepts published Ogre and pioneered the microgame, a small and easy-to-learn wargame, often with a fantasy or science fiction theme, packaged in a ziplock bag or thin plastic case.
"[3] In the July 1980 edition of Dragon, Tony Watson liked Intruder, saying, "There was a game in that movie [Alien], and Task Force has done a fine job of extracting and offering it to us in a pocket-game format."
"[1] Roger Sandell reviewed Intruder for White Dwarf #21, giving it an overall rating of 6 out of 10, and stated that "in the end, my feeling is that this game is a good idea which needs further development.