Free Outbreak Sim Games on Steam
Steam currently has 318 Outbreak Sim 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 Outbreak Sim game rankings were last updated on 5/1/2026.
Looking for more? Explore other lists such as:
- Best outbreak sim games on Steam
- Best outbreak sim Steam Deck games
- Best outbreak sim Steam games for Mac OS
- Best outbreak sim Linux games on Steam
- Free Steam games
- Most played Steam games
- Best rated Steam games
1. State of Survival
Survive the Zombies War in this RPG game of Apocalypse and Survival
State of Survival holds the #1 spot for "best free Outbreak Sim game on Steam" with a Player Score of 56. Its score was calculated by analyzing a total of 462 reviews on Steam. This breaks down to a total of 264 positive reviews and 198 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 State of Survival on the Steam Deck.
| Release Date | 8/2/2023 |
| Developer | FunPlus International AG |
| Publisher | FunPlus International AG |
| Steam App Id | 2485460 |
2. Zombie Commander
Zombie Commander is a strategy game about bringing the extinction of humanity by a zombies invasion, and lead the apocalpyse !
Zombie Commander has achieved a Player Score of 64, placing it in the #2 spot for the best free Outbreak Sim games. Its score was calculated by analyzing a total of 48 reviews on Steam. This breaks down to a total of 34 positive reviews and 14 negative reviews — making it "Mostly Positive" on Steam.
It can be played and ran on Windows systems. At the moment, it is possible to play Zombie Commander on the Steam Deck (though some functionality may be limited).
3. Infection Free Zone – Prologue
Experience the first 8 days of the Zone in the Prologue to the widely anticipated post-apocalyptic city-builder game. Lead the survivors, rebuild the city, and fight against the deadly hordes of the infected. Play on 6 different real cities from around the world.
Infection Free Zone – Prologue has achieved a Player Score of 88, placing it in the #3 spot for the best free Outbreak Sim games. Its score was calculated by analyzing a total of 4,546 reviews on Steam. This breaks down to a total of 4,141 positive reviews and 405 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 Infection Free Zone – Prologue on the Steam Deck (though some functionality may be limited).
| Release Date | 10/19/2023 |
| Franchise | Games Operators |
| Developer | Jutsu Games |
| Publisher | Games Operators |
| Steam App Id | 2485640 |
4. CATpillAr
“CATpillAr” is a horror-themed VR mini-game that requires you to collect big, juicy, hairy, creepy caterpillars crawling around an empty hospital. In VR, you can grab harmless giant caterpillars by the neck and throw them inside the bucket. Replay and see how many you can collect!
CATpillAr has achieved a Player Score of 54, placing it in the #4 spot for the best free Outbreak Sim games. Its score was calculated by analyzing a total of 5 reviews on Steam. This breaks down to a total of 3 positive reviews and 2 negative reviews — making it "5 user reviews" on Steam.
It can be played and ran on Windows systems. At the moment, there is no confirmed information regarding Steam Deck support for this game.
5. Icon_survive
Escape from the Zombie Island Use cards scattered around the map to collect items Craft items Attempt to escape before the map is overrun by zombies
Icon_survive has achieved a Player Score of 63, placing it in the #5 spot for the best free Outbreak Sim games. Its score was calculated by analyzing a total of 5 reviews on Steam. This breaks down to a total of 4 positive reviews and 1 negative reviews — making it "5 user reviews" on Steam.
It can be played and ran on both Windows and Mac systems. At the moment, there is no confirmed information regarding Steam Deck support for this game.
6. Zombie Siege City
Grab your weapon, enjoy the thrill of zombie shooting, and don't stop firing until every last zombie is... well and truly dead. Earn rewards for your efforts, unlock new weapons, upgrade existing ones, and exterminate as many walking dead as possible.
Zombie Siege City has achieved a Player Score of 60, placing it in the #6 spot for the best free Outbreak Sim games. Its score was calculated by analyzing a total of 98 reviews on Steam. This breaks down to a total of 62 positive reviews and 36 negative reviews — making it "Mixed" on Steam.
It can be played and ran on Windows systems. At the moment, there is no confirmed information regarding Steam Deck support for this game.
| Release Date | 11/2/2024 |
| Developer | STAR WORKS COMPANY LIMITED |
| Publisher | STAR WORKS COMPANY LIMITED |
| Steam App Id | 3116530 |
7. 丧尸世界-经典策略卡牌养成
Zombie World is a free placement strategy game. You will lead your hero team to search for materials, explore secret places, fight against foreign enemies and build your own hero base in the dangerous end times.
丧尸世界-经典策略卡牌养成 has achieved a Player Score of 39, placing it in the #7 spot for the best free Outbreak Sim games. Its score was calculated by analyzing a total of 13 reviews on Steam. This breaks down to a total of 4 positive reviews and 9 negative reviews — making it "Mostly Negative" on Steam.
It can be played and ran on Windows systems. At the moment, it is not possible to play or run 丧尸世界-经典策略卡牌养成 on the Steam Deck.
| Release Date | 3/10/2023 |
| Developer | 团队集结，决战末日巅峰 |
| Publisher | 官方QQ群：873997466 |
| Steam App Id | 2264970 |
8. Cat Colony Crisis
You are tasked with helping a colony ship full of space-faring cats deal with a mysterious disease outbreak! Will you act fast and stop the spread of this disease or will it spread unchecked and ravage your Cat Colony.
Cat Colony Crisis has achieved a Player Score of 80, placing it in the #8 spot for the best free Outbreak Sim games. Its score was calculated by analyzing a total of 56 reviews on Steam. This breaks down to a total of 52 positive reviews and 4 negative reviews — making it "Very Positive" on Steam.
It can be played and ran on Windows, Mac, and Linux systems. At the moment, there is no confirmed information regarding Steam Deck support for this game.
| Release Date | 2/9/2021 |
| Developer | Devil's Cider Games |
| Publisher | Devil's Cider Games |
| Steam App Id | 1516760 |
9. 全城警戒-世界大战一触即发，跪求指挥官！
《全城警戒》是一款以策略战争、现代军事为题材的战争策略游戏。在这里，能源耗尽、危机丛生，只有王者才能恢复世界的秩序！全面发展基地、抢占资源工厂、突破敌方防线，攻占中心城市，惩恶除奸，扬我国威！
全城警戒-世界大战一触即发，跪求指挥官！ has achieved a Player Score of 54, placing it in the #9 spot for the best free Outbreak Sim games. Its score was calculated by analyzing a total of 25 reviews on Steam. This breaks down to a total of 14 positive reviews and 11 negative reviews — making it "Mixed" on Steam.
It can be played and ran on Windows systems. At the moment, it is possible to play 全城警戒-世界大战一触即发，跪求指挥官！ on the Steam Deck (though some functionality may be limited).
| Release Date | 4/7/2023 |
| Developer | 客服VX-kf525vip |
| Publisher | 客服QQ-969613426 |
| Steam App Id | 2358210 |
10. The Crawling Dead
Design, deploy, and manage the release of parasitic wasps to save a national park from invasive insect pests. Harness the power of nature’s most efficient killers to strike back at the invaders and turn them into The Crawling Dead!
The Crawling Dead has achieved a Player Score of 69, placing it in the #10 spot for the best free Outbreak Sim games. Its score was calculated by analyzing a total of 13 reviews on Steam. This breaks down to a total of 11 positive reviews and 2 negative reviews — making it "Positive" on Steam.
It can be played and ran on Windows systems. At the moment, there is no confirmed information regarding Steam Deck support for this game.
| Release Date | 9/9/2025 |
| Developers | |
| Publishers | |
| Steam App Id | 3900450 |
More Free Outbreak Sim Games
Explore even more rankings for the 25 best free Outbreak Sim games available on Steam.
| Image | Name | Actions | ||||
|---|---|---|---|---|---|---|
| 98 | 8/2/2023 | 56 | Free | Steam Charts | |
| 2 | 5/14/2018 | 64 | Free | Steam Charts | |
| 2 | 10/19/2023 | 88 | Free | Steam Charts | |
| 1 | 5/15/2025 | 54 | Free | Steam Charts | |
| 1 | 12/31/2024 | 63 | Free | Steam Charts | |
| 1 | 11/2/2024 | 60 | Free | Steam Charts | |
| 1 | 3/10/2023 | 39 | Free | Steam Charts | |
| 1 | 2/9/2021 | 80 | Free | Steam Charts | |
| 1 | 4/7/2023 | 54 | Free | Steam Charts | |
| 1 | 9/9/2025 | 69 | Free | Steam Charts | |
 | 1 | 1/18/2024 | 63 | Free | Steam Charts | |
 | 1 | 8/9/2022 | 66 | Free | Steam Charts | |
 | 1 | 11/17/2021 | 66 | Free | Steam Charts | |
 | 1 | 1/28/2025 | 62 | Free | Steam Charts | |
 | 1 | 1/27/2023 | 63 | Free | Steam Charts | |
 | 1 | 5/10/2022 | 78 | Free | Steam Charts | |
 | 1 | 8/2/2023 | 66 | Free | Steam Charts | |
 | 1 | 8/23/2021 | 74 | Free | Steam Charts | |
 | 1 | 6/22/2022 | 61 | Free | Steam Charts | |
 | 1 | 3/17/2021 | 71 | 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, May 1). Steam Store. Steam Store.
- Valve Corporation. (2026, May 1). State of Survival on Steam. Steam Store.
- Valve Corporation. (2026, April 2). Zombie Commander on Steam. Steam Store.
- Valve Corporation. (2025, May 19). Infection Free Zone – Prologue on Steam. Steam Store.
- Valve Corporation. (2026, April 3). CATpillAr on Steam. Steam Store.
- Valve Corporation. (2026, April 3). Icon_survive on Steam. Steam Store.
- Valve Corporation. (2026, March 7). Zombie Siege City on Steam. Steam Store.
- Valve Corporation. (2026, April 3). 丧尸世界-经典策略卡牌养成 on Steam. Steam Store.
- Valve Corporation. (2026, April 3). Cat Colony Crisis on Steam. Steam Store.
- Valve Corporation. (2026, April 3). 全城警戒-世界大战一触即发，跪求指挥官！ on Steam. Steam Store.
- Valve Corporation. (2026, April 7). The Crawling Dead on Steam. Steam Store.