The game was also released on GOG.com shortly after it appeared on Steam. The Steam Edition is also optimized for modern computer systems and software. Steam Workshop support came out in Patch 3. The Steam version includes all patches and expansion packs released in the past, the IC Online servers reimplemented through Steam's cloud service and the game's modding software development kit included in the package alongside the Mission Editor originally available within the game's files.

Relic Entertainment and Sega relinquished the rights of Impossible Creatures to THQ Nordic after it was revealed that neither THQ nor Microsoft Studios owned the rights to the video game. On November 12, 2015, Impossible Creatures was released on Steam as Impossible Creatures: Steam Edition, by THQ Nordic.

The last official add on for Impossible Creatures was released in 2004. Impossible Creatures was followed up later by a free downloadable expansion entitled Insect Invasion which added new creatures and abilities to the game. There is an extensive single-player campaign as well as online multiplayer functionality with different game modes, add-ons, custom maps, mods, and scenarios. Many animals possess inherent abilities to add more strategic depth to the game. Wells, the armies consist of 9 creatures each one is a combination of any two animals from a list of 76 (51 with no downloads). Its unique feature is that the armies used are all created by the player. Impossible Creatures is a steampunk real-time strategy game released in 2003 and developed by Relic Entertainment in conjunction with Microsoft Studios.

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