Games like Terraforming Mars on Steam
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CoH 2 - The Western Front Armies: Oberkommando West
This individual army for COH2 allows you to access all existing COH2 maps in auto-match, and play against all other existing factions in multiplayer. It can also be obtained at a discount by acquiring The Western Front Armies multiplayer standalone, where it is bundled with the USF army.
Pathfinder Adventures
Pathfinder Adventures translates the best-selling Pathfinder Adventure Card Game into an entirely new breed of digital card game, where players adventure collaboratively to battle monsters and villains, and acquire new feats, items, weapons, and allies.
BATTLETECH
Take command of your own mercenary outfit of 'Mechs and the MechWarriors that pilot them, struggling to stay afloat as you find yourself drawn into a brutal interstellar civil war.
Distant Worlds 2
Distant Worlds 2 is a vast, pausable real-time 4X space strategy game.
Cat Lady - The Card Game
Cat Lady - The Card Game is a fun card-drafting game in which players are Cat Ladies, trying to tempt cats into their cattery using food, toys, costumes and more. Based on the much-loved card game by AEG.
Aven Colony
Build a new home for humanity in Aven Colony. Discover Aven Prime - an alien planet of deserts, tundras, and wetlands light years from earth. Build your colonies into massive, sprawling cities whilst dealing with the challenges faced when settling on a new world.
Field of Glory II
Field of Glory II is a turn-based tactical game set during the Rise of Rome from 280 BC to 25 BC.
Reassembly
A spaceship building and universe-exploration game. Collect resources, expand and grow your fleet, and conquer your personal galaxy. Stellar ambience by Peaks.
Lock 'n Load Tactical Digital: Core Game
Lock 'n Load Tactical is fast and Furious tactical combat that is fast to learn. In LnLT you get squads, weapon teams, armored vehicles, fixed-wing aircraft, and, in the modern-era games, helicopters. Individuals such as Leaders, Medics, Snipers, Chaplains, Advisors, and, of course, Heroes.
Warlock - Master of the Arcane
In a time of chaotic upheaval, the player takes the role of a great mage, a warlord vying for ultimate power.
X3: Terran Conflict
It is the year 2938. The long wished-for encounter of the X Universe and the Earth holds both joy and sorrow for the people. Despite flourishing trade, the clash of the diverse races, cultures and life forms creates new tensions, mistrust and open conflict that need to be overcome!
Space Rogue
Take on the role of a spaceship captain. Explore new worlds, and engage in intense ship-to-ship battles. Develop unique battle tactics, upgrade your ship, and recruit crew members as you fight for peace or piracy.