Steam Edition Features:
- Fully remastered to work with modern systems
- Insect Invasion, Mod SDK (C++) and all patches included
- Re-implemented multiplayer and NAT traversal for a smooth online experience
- Steam Friend invite implemented
- Steam cloud support

Key Features:
- Thousands of units: ?Impossible Creatures? has more than 50 animals that can be combined to create a vast number of mutant creatures, the results of which are limited only by players? creativity.
- Strategies as boundless as your imagination -- By building these creatures into powerful and effective armies, players can define their strategy and how they want to tackle their opponents.
- Explore rich 3-D worlds ? The highly detailed, fully 3-D dynamic world allows players to battle in four richly detailed environments, each with special flora and fauna.
- Compelling single-player campaigns ? Players command dozens of creatures, and henchmen in 15 missions across 14 distinct islands.
- Unprecedented replayability ? ?Impossible Creatures? offers boundless creature combinations, armies, and strategies as well as online play and an easy-to-use mission editor that provides limitless play options.
- Unique multiplayer options ? Up to six ?Impossible Creatures? players will be able to wage war in real time. The multiplayer component will streamline base-building, allowing players to build creatures offline and store them for future online battles.
- Transferable units ? Players can refine their armies in the single-player campaign, and test their strategies with the same armies in a multiplayer game.