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Impossible Creatures is a real-time strategy with a twist. Rather than building "Unit A" and "Unit B" like nearly all other real-time strategies, in this game the player acquires DNA from animals and mesh them together, creating unique hybrids of two separate animals. Use the strength of a bull, with the speed of a cheetah and the player might have a Cheebull, or give a skunk an extra defense and mix in a porcupine, making a Porskunkine. With dozens of different animal DNA to combine, there are nearly endless combinations.

The main campaign's storyline is something like this. Your father, whom you've not seen since your childhood, sends you a letter in which he says he does not have long to live, and there is a secret he must tell you before he passes on. So you head to one of the uncharted islands in which he works, but you're suddenly ambushed by half-wolf, half-scorpion freaks of nature. Using the creature workshop and DNA collected from the animals, you must create hybrids of your own to rescue your father.

Each creature hybrid has several areas of the body in which can be meshed together. The head, pawns, legs, back, rear, can all be attributed by either of the two creatures involved in the mix.


Impossible Creatures Windows Destroying the enemy lab (the big building in the middle) is the only way to win a match
Impossible Creatures Windows After a match, you can see a complete report of the combat, including the best creatures.
Impossible Creatures Windows Adjusting the Camera, I can see my Henchmen like a FPS!
Impossible Creatures Windows Loading screen

Promo Images

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Alternate Titles

  • "不可思议之生物" -- Chinese spelling (simplified)
  • "Sigma: The Adventures of Rex Chance" -- Working title
  • "Sigma" -- Working title
  • "Bukesiyi zhi Shengwu" -- Chinese title

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User Reviews

Too bad the interesting premise is wasted on a generic boring RTS weregamer (157) 2 Stars2 Stars2 Stars2 Stars2 Stars
Excellent Idea, But Could Be Improved Black Death (6) unrated

Critic Reviews

Game Chronicles May 21, 2003 9.2 out of 10 92
IGN Jan 09, 2003 8.3 out of 10 83 Feb 08, 2003 82 out of 100 82
Joystick (French) Feb, 2003 8 out of 10 80
GameStar (Germany) Feb, 2003 79 out of 100 79
PC Zone Benelux Mar, 2003 78 out of 100 78
Absolute Games ( Jan 23, 2003 70 out of 100 70 (UK) Feb 25, 2003 7 out of 10 70
Factornews Mar 03, 2003 6 out of 10 60 Games Mar 28, 2003 5 out of 10 50


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There is an add-on for the game, Impossible Creatures: Insect Invasion, available from Relic's official IC site for free (size: 88 Mb).


The game's graphical rendering engine is called SPOOGE. There is a separated physics/collision, AI/script, and combiner engine too.


During development, this game actually underwent no fewer than two official name changes, first from just plain Sigma to Sigma: The Adventures of Rex Chance and then finally to Impossible Creatures as we know it now.

Information also contributed by Rev-san

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kbmb (399) added Impossible Creatures (Windows) on Feb 19, 2003