Free Base Building Games on Steam
Steam currently has 4,280 Base Building games available to download and play. Explore our list of the best free games ranked by popularity and ratings. Data for this list is calculated from reviews and player counts reported directly by Steam and will be updated in real-time. Free Base Building game rankings were last updated on 3/12/2026.
Looking for more? Explore other lists such as:
- Best base building games on Steam
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- Most played Steam games
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1. Once Human
Once Human is a multiplayer open-world survival game set in a strange, post-apocalyptic future. Unite with friends to fight monstrous enemies, uncover secret plots, compete for resources, and build your own territory. Once, you were merely human. Now, you have the power to remake the world.
Once Human holds the #1 spot for "best free Base Building game on Steam" with a Player Score of 77. Its score was calculated by analyzing a total of 166,127 reviews on Steam. This breaks down to a total of 128,341 positive reviews and 37,786 negative reviews — making it "Mostly Positive" on Steam.
It can be played and ran on Windows systems. At the moment, it is not possible to play or run Once Human on the Steam Deck.
| Release Date | 7/9/2024 |
| Developer | Starry Studio |
| Publishers | |
| Steam App Id | 2139460 |
2. Age of Empires III: Definitive Edition
Age of Empires III: Definitive Edition offers players a trial of this historical single & multiplayer RTS experience. *Note: To unlock all features of the game please see the “Base Game” product.
Age of Empires III: Definitive Edition has achieved a Player Score of 84, placing it in the #2 spot for the best free Base Building games. Its score was calculated by analyzing a total of 52,434 reviews on Steam. This breaks down to a total of 44,744 positive reviews and 7,690 negative reviews — making it "Very Positive" on Steam.
It can be played and ran on Windows systems. At the moment, it is possible to play Age of Empires III: Definitive Edition on the Steam Deck (though some functionality may be limited).
| Release Date | 10/15/2020 |
| Franchise | Age of Empires Franchise |
| Developers | |
| Publisher | Xbox Game Studios |
| Steam App Id | 933110 |
3. Shop Titans
Shop Titans is the ultimate RPG shopkeeper simulation. Craft powerful equipment, stock your shop and sell to aspiring heroes… at a markup! Hire heroes and explore dungeons to gather valuable materials to craft with. There’s never a dull moment in the world of Shop Titans!
Shop Titans has achieved a Player Score of 77, placing it in the #3 spot for the best free Base Building games. Its score was calculated by analyzing a total of 17,678 reviews on Steam. This breaks down to a total of 13,806 positive reviews and 3,872 negative reviews — making it "Mostly Positive" on Steam.
It can be played and ran on Windows systems. Valve has also verified it as playable on the Steam Deck and will run well.
| Release Date | 5/5/2020 |
| Developer | Kabam Games, Inc. |
| Publisher | Kabam Games, Inc. |
| Steam App Id | 1258080 |
4. Fallout Shelter
Fallout Shelter puts you in control of a state-of-the-art underground Vault from Vault-Tec. Build the perfect Vault, keep your Dwellers happy, and protect them from the dangers of the Wasteland.
Fallout Shelter has achieved a Player Score of 87, placing it in the #4 spot for the best free Base Building games. Its score was calculated by analyzing a total of 79,922 reviews on Steam. This breaks down to a total of 70,324 positive reviews and 9,598 negative reviews — making it "Very Positive" on Steam.
It can be played and ran on Windows systems. Valve has also verified it as playable on the Steam Deck and will run well.
| Release Date | 3/29/2017 |
| Developer | Bethesda Game Studios |
| Publisher | Bethesda Softworks |
| Steam App Id | 588430 |
5. Muck
Muck is a survival-roguelike. Collect resources, find items & build a base to survive for as long as you can.
Muck has achieved a Player Score of 92, placing it in the #5 spot for the best free Base Building games. Its score was calculated by analyzing a total of 181,630 reviews on Steam. This breaks down to a total of 169,654 positive reviews and 11,976 negative reviews — making it "Very Positive" on Steam.
It can be played and ran on Windows, Mac, and Linux systems. At the moment, it is possible to play Muck on the Steam Deck (though some functionality may be limited).
6. The Perfect Tower II
The Perfect Tower II is a mix between an incremental and a tower defense game. Build a town, manage resources and explore a variety of mini-games and tons of upgrades. Fully automate your game and watch numbers going up!
The Perfect Tower II has achieved a Player Score of 84, placing it in the #6 spot for the best free Base Building games. Its score was calculated by analyzing a total of 4,211 reviews on Steam. This breaks down to a total of 3,661 positive reviews and 550 negative reviews — making it "Very Positive" on Steam.
It can be played and ran on Windows systems. At the moment, it is possible to play The Perfect Tower II on the Steam Deck (though some functionality may be limited).
| Release Date | 11/30/2025 |
| Franchise | Fire Sword Studios |
| Developer | Fire Sword Studios |
| Publisher | Fire Sword Studios |
| Steam App Id | 1197260 |
7. March of Empires
Claim your title as Shogun, Highland King, Northern Tsar or Desert Sultan and join this genre-redefining strategy game where you will wage constant war for real territorial conquest! Fortify your castle, fuel a massive army, and enter the ultimate fight for realm domination!
March of Empires has achieved a Player Score of 62, placing it in the #7 spot for the best free Base Building games. Its score was calculated by analyzing a total of 1,803 reviews on Steam. This breaks down to a total of 1,134 positive reviews and 669 negative reviews — making it "Mixed" on Steam.
It can be played and ran on Windows systems. At the moment, it is possible to play March of Empires on the Steam Deck (though some functionality may be limited).
8. SUPREMACY: WORLD WAR 3
This Long Term Strategy Game lets you take control of the armed forces of your nation. Become responsible for its military expansion, technological research and economic development. Form alliances and wage total war for global dominance on the battlefields of World War 3.
SUPREMACY: WORLD WAR 3 has achieved a Player Score of 73, placing it in the #8 spot for the best free Base Building games. Its score was calculated by analyzing a total of 5,781 reviews on Steam. This breaks down to a total of 4,348 positive reviews and 1,433 negative reviews — making it "Mostly Positive" on Steam.
It can be played and ran on both Windows and Mac systems. At the moment, it is not possible to play or run SUPREMACY: WORLD WAR 3 on the Steam Deck.
| Release Date | 3/15/2018 |
| Developer | Dorado Games |
| Publisher | Dorado Games |
| Steam App Id | 784950 |
9. DARKEST DAYS
DARKEST DAYS is a zombie shooting RPG set in a post-apocalyptic world devastated by a sudden zombie outbreak. Explore a dark yet captivating open world, build a sanctuary with fellow survivors, grow stronger, and fight for survival.
DARKEST DAYS has achieved a Player Score of 49, placing it in the #9 spot for the best free Base Building games. Its score was calculated by analyzing a total of 4,610 reviews on Steam. This breaks down to a total of 2,272 positive reviews and 2,338 negative reviews — making it "Mixed" on Steam.
It can be played and ran on Windows systems. At the moment, it is not possible to play or run DARKEST DAYS on the Steam Deck.
10. Doomsday: Last Survivors
New tower defense gameplay! The apocalypse has come, and zombies are running amok. As the leader of the survivors, collect and use resources to defend their last shelter!
Doomsday: Last Survivors has achieved a Player Score of 64, placing it in the #10 spot for the best free Base Building games. Its score was calculated by analyzing a total of 834 reviews on Steam. This breaks down to a total of 553 positive reviews and 281 negative reviews — making it "Mixed" on Steam.
It can be played and ran on Windows systems. At the moment, it is possible to play Doomsday: Last Survivors on the Steam Deck (though some functionality may be limited).
| Release Date | 6/26/2023 |
| Developer | IGG SINGAPORE PTE. LTD. |
| Publisher | IGG SINGAPORE PTE. LTD. |
| Steam App Id | 2439510 |
More Free Base Building Games
Explore even more rankings for the 100 best free Base Building games available on Steam.
| Image | Name | Actions | ||||
|---|---|---|---|---|---|---|
| 10,516 | 7/9/2024 | 77 | Free | Steam Charts | |
| 3,552 | 10/15/2020 | 84 | Free | Steam Charts | |
| 2,649 | 5/5/2020 | 77 | Free | Steam Charts | |
| 2,041 | 3/29/2017 | 87 | Free | Steam Charts | |
| 1,070 | 6/5/2021 | 92 | Free | Steam Charts | |
| 980 | 11/30/2025 | 84 | Free | Steam Charts | |
| 564 | 12/11/2017 | 62 | Free | Steam Charts | |
| 542 | 3/15/2018 | 73 | Free | Steam Charts | |
| 528 | 4/24/2025 | 49 | Free | Steam Charts | |
| 480 | 6/26/2023 | 64 | Free | Steam Charts | |
 | 480 | 5/22/2024 | 67 | Free | Steam Charts | |
 | 466 | 8/31/2022 | 89 | Free | Steam Charts | |
 | 453 | 12/5/2025 | 72 | Free | Steam Charts | |
 | 435 | 6/15/2017 | 84 | Free | Steam Charts | |
 | 381 | 5/6/2021 | 88 | Free | Steam Charts | |
 | 366 | 10/8/2019 | 84 | Free | Steam Charts | |
 | 353 | 8/17/2023 | 97 | Free | Steam Charts | |
 | 344 | 9/18/2014 | 70 | Free | Steam Charts | |
 | 329 | 7/2/2021 | 55 | Free | Steam Charts | |
 | 301 | 2/27/2012 | 63 | Free | Steam Charts |
Soures & References
Steambase has best-in-class data powered directly by Steam, our data partners, and in-house experts. Player counts and rankings are enriched, analyzed, and updated in real-time to ensure we surface the most up-to-date insights. Learn more about the Steambase approach to data collection and our review methodology.
- Valve Corporation. (2026, March 12). Steam Store. Steam Store.
- Valve Corporation. (2026, March 12). Once Human on Steam. Steam Store.
- Valve Corporation. (2026, March 13). Age of Empires III: Definitive Edition on Steam. Steam Store.
- Valve Corporation. (2026, February 26). Shop Titans on Steam. Steam Store.
- Valve Corporation. (2026, March 14). Fallout Shelter on Steam. Steam Store.
- Valve Corporation. (2026, January 14). Muck on Steam. Steam Store.
- Valve Corporation. (2026, March 12). The Perfect Tower II on Steam. Steam Store.
- Valve Corporation. (2026, March 11). March of Empires on Steam. Steam Store.
- Valve Corporation. (2025, November 3). SUPREMACY: WORLD WAR 3 on Steam. Steam Store.
- Valve Corporation. (2026, March 11). DARKEST DAYS on Steam. Steam Store.
- Valve Corporation. (2026, March 10). Doomsday: Last Survivors on Steam. Steam Store.