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Check out the top 10 free-to-play colony sim games you can enjoy on Steam right now, updated on October 15th 2026. Looking for even more free titles? Explore the complete list of the best free to play colony sim games on Steam.
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1. My Singing Monsters
Dive into the Musical World of My Singing Monsters! Breed them, feed them, listen to them sing! Breed & collect a menagerie of Monsters, each a living instrument! Build your paradise across 35+ Islands, customize your world, and enjoy endless music! There's never a dull moment in the Monster World! My Singing Monsters is a creature collector, casual and simulation game. Released on March 24th 2021 has received 49,806 reviews of which 46,320 were positive and 3,486 were negative resulting in an impressive rating of 9.1 out of 10. The game has hit the top spot as the #1 most played colony sim game, thanks to its 1,214 peak concurrent players over the last day.
9.1
46,320
3,486
1,214
players
2. Diplomacy is Not an Option: Shareware
Diplomacy is Not an Option: Shareware is a free prequel to the original game. In a medieval fantasy world, you are to build settlements, raise huge armies, and defend against massive hordes of enemies. Learn how Ironbrow clan shaped the world's map the first time - if you survive, that is. Diplomacy is Not an Option: Shareware is a strategy, city builder and colony sim game. Released on April 30th 2025 has received 828 reviews of which 761 were positive and 67 were negative resulting in a rating of 8.6 out of 10. The game currently holds the #2 spot among the most played colony sim games.
8.6
761
67
29
players
3. Don't get lost
A procedurally-generated, open-world, first-person colony sim. Build colonies in an infinite world, alone or with friends via Steam or self-hosted multiplayer. Don't get lost is a colony sim, multiplayer and procedural generation game. Released on February 01st 2023 has received 480 reviews of which 377 were positive and 103 were negative resulting in a rating of 7.4 out of 10. The game currently holds the #3 spot among the most played colony sim games.
7.4
377
103
3
players
4. Terraformers: First Steps on Mars
Terraformers: First Steps on Mars is a free prologue of Terraformers, featuring an exclusive challenge to lead humanity's first attempt at settling the Red Planet. Terraformers: First Steps on Mars is a strategy, simulation and colony sim game. Released on October 23rd 2021 has received 703 reviews of which 619 were positive and 84 were negative resulting in a rating of 8.3 out of 10. The game currently holds the #4 spot among the most played colony sim games.
8.3
619
84
5. Colony Simulator
Can your Colony survive 10 days or more in the desert? Find food, build your colony, recruit new workers, feed your population, craft tools and equipment, cook food and research technologies! Colony Simulator is a simulation, city builder and colony sim game. Released on February 08th 2022 has received 420 reviews of which 278 were positive and 142 were negative resulting in a rating of 6.4 out of 10. The game currently holds the #5 spot among the most played colony sim games.
6.4
278
142
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