Impossible Creatures is a 2003 steampunk real-time strategy game developed by Relic Entertainment and published by Microsoft Game Studios. Its unique feature is that the armies used in gameplay are all created by the player, and involve combining two animals to make a new super creature with various abilities. The concept was inspired by H. G. Wells' novel The Island of Doctor Moreau. The player-created armies are capped at 9 creatures; each one is a combination of any two animals from a list of 76 (51 with no downloads). Many animals possess inherent abilities to add more strategic depth 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. Impossible Creatures was followed up later by a free downloadable expansion entitled Insect Invasion which added new creatures and abilities to the game. The last official add-on for Impossible Creatures was released in 2004. On November 12, 2015, Impossible Creatures was released on Steam as Impossible Creatures: Steam Edition, by THQ Nordic. 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. 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. Steam Workshop support came out in Patch 3. The Steam Edition is also optimized for modern computer systems and software. The game was also released on GOG.com shortly after it appeared on Steam. Gameplay Campaign This mode consists of 15 different missions, spanning over a group of islands in the South Pacific known as the Isla Variatas, indicating the variety of environments presented to the player, ranging from jungles, deserts, or Arctic regions. The protagonist Rex Chance is required to collect animal DNA throughout the campaign in order to add more animal varieties to his army of combined creatures. Multiplayer In Impossible Creatures, there are three game types available during multiplayer, which allows for up to six players at once. In "Destroy Enemy Lab", the first to destroy the enemies' main laboratories is the winner. The Insect Invasion official mod added a feature that can be turned on that defends the