Free Outbreak Sim Games on Steam
Steam currently has 248 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 5/30/2025.
Looking for more? Explore other lists such as:
- Best outbreak sim games on Steam
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- Most played Steam games
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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 411 reviews on Steam. This breaks down to a total of 235 positive reviews and 176 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. Post-Apo Builder: Prologue
Discover a post-apocalyptic world Collect resources and manage people Build your colony on the remains of an oil tanker Prepare supplies and vehicles for a dangerous expedition. Complete challenging tasks from the council of elders
Post-Apo Builder: Prologue has achieved a Player Score of 67, placing it in the #2 spot for the best free Outbreak Sim games. Its score was calculated by analyzing a total of 424 reviews on Steam. This breaks down to a total of 296 positive reviews and 128 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 Post-Apo Builder: Prologue on the Steam Deck.
| Release Date | 8/2/2023 |
| Franchise | G-DEVS Games |
| Developer | Septarian Games |
| Publishers | |
| Steam App Id | 2130380 |
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 4,570 reviews on Steam. This breaks down to a total of 4,163 positive reviews and 407 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 56, placing it in the #4 spot for the best free Outbreak Sim games. Its score was calculated by analyzing a total of 3 reviews on Steam. This breaks down to a total of 2 positive reviews and 1 negative reviews — making it "3 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. 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 #5 spot for the best free Outbreak Sim games. Its score was calculated by analyzing a total of 52 reviews on Steam. This breaks down to a total of 48 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 |
6. 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 38, placing it in the #6 spot for the best free Outbreak Sim games. Its score was calculated by analyzing a total of 11 reviews on Steam. This breaks down to a total of 3 positive reviews and 8 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 |
7. Plane Accident: Prologue
Dive into the heart of aviation mysteries in "Plane Accident: Prologue." Explore realistic crash sites, analyze evidence, and solve puzzles. Unveil the truth in this thrilling prelude to the full "Plane Accident" experience.
Plane Accident: Prologue has achieved a Player Score of 63, placing it in the #7 spot for the best free Outbreak Sim games. Its score was calculated by analyzing a total of 45 reviews on Steam. This breaks down to a total of 31 positive reviews and 14 negative reviews — making it "Mixed" on Steam.
It can be played and ran on Windows systems. At the moment, it is possible to play Plane Accident: Prologue on the Steam Deck (though some functionality may be limited).
| Release Date | 1/18/2024 |
| Franchise | Duality Games |
| Developers | |
| Publishers | |
| Steam App Id | 2104670 |
8. Final Redoubt: Zombie Apocalypse
Survive the onslaught, manage your ammo, and endure in Final Redoubt, a relentless survival shooter where every bullet, every swing, and every decision counts!
Final Redoubt: Zombie Apocalypse has achieved a Player Score of 57, placing it in the #8 spot for the best free Outbreak Sim games. Its score was calculated by analyzing a total of 6 reviews on Steam. This breaks down to a total of 4 positive reviews and 2 negative reviews — making it "6 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.
| Release Date | 1/28/2025 |
| Developers | |
| Publisher | Jonathan T Freeman |
| Steam App Id | 3443680 |
9. Life on the Edge
Life on the Edge is an educational tower defense game. You play as a cell struggling to survive waves of bacteria and the COVID-19 virus. Protect your cell and build an understanding of cell biology at the same time!
Life on the Edge has achieved a Player Score of 80, placing it in the #9 spot for the best free Outbreak Sim games. Its score was calculated by analyzing a total of 91 reviews on Steam. This breaks down to a total of 82 positive reviews and 9 negative reviews — making it "Very Positive" 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.
10. Doomsday Dispute
Doomsday Dispute introduces a post-apocalypse world where you need to survive and find other survivors to start a new civilization.
Doomsday Dispute has achieved a Player Score of 67, placing it in the #10 spot for the best free Outbreak Sim games. Its score was calculated by analyzing a total of 119 reviews on Steam. This breaks down to a total of 86 positive reviews and 33 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 Doomsday Dispute on the Steam Deck.
| Release Date | 11/17/2021 |
| Developer | Doomsday Dispute |
| Publisher | Doomsday Dispute |
| Steam App Id | 1792710 |
More Free Outbreak Sim Games
Explore even more rankings for the 20 best free Outbreak Sim games available on Steam.
| Image | Name | Actions | ||||
|---|---|---|---|---|---|---|
| 112 | 8/2/2023 | 56 | Free | Steam Charts | |
| 4 | 8/2/2023 | 67 | Free | Steam Charts | |
| 2 | 10/19/2023 | 88 | Free | Steam Charts | |
| 1 | 5/15/2025 | 56 | Free | Steam Charts | |
| 1 | 2/9/2021 | 80 | Free | Steam Charts | |
| 1 | 3/10/2023 | 38 | Free | Steam Charts | |
| 1 | 1/18/2024 | 63 | Free | Steam Charts | |
| 1 | 1/28/2025 | 57 | Free | Steam Charts | |
| 1 | 6/17/2022 | 80 | Free | Steam Charts | |
| 1 | 11/17/2021 | 67 | Free | Steam Charts | |
 | 1 | 12/31/2024 | 56 | Free | Steam Charts | |
 | 1 | 3/17/2021 | 72 | Free | Steam Charts | |
 | 1 | 1/27/2023 | 62 | Free | Steam Charts | |
 | 1 | 5/10/2022 | 78 | Free | Steam Charts | |
 | 1 | 11/2/2024 | 64 | Free | Steam Charts | |
 | 1 | 3/7/2024 | 80 | Free | Steam Charts | |
 | 1 | 4/7/2023 | 52 | Free | Steam Charts | |
 | 1 | 1/8/2024 | 76 | Free | Steam Charts | |
 | 1 | 8/9/2022 | 67 | Free | Steam Charts | |
 | 1 | 6/23/2022 | 60 | 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. (2025, May 30). Steam Store. Steam Store.
- Valve Corporation. (2025, May 30). State of Survival on Steam. Steam Store.
- Valve Corporation. (2025, May 15). Post-Apo Builder: Prologue on Steam. Steam Store.
- Valve Corporation. (2025, May 19). Infection Free Zone – Prologue on Steam. Steam Store.
- Valve Corporation. (2025, May 15). CATpillAr on Steam. Steam Store.
- Valve Corporation. (2025, April 30). Cat Colony Crisis on Steam. Steam Store.
- Valve Corporation. (2025, May 15). 丧尸世界-经典策略卡牌养成 on Steam. Steam Store.
- Valve Corporation. (2025, May 16). Plane Accident: Prologue on Steam. Steam Store.
- Valve Corporation. (2025, March 30). Final Redoubt: Zombie Apocalypse on Steam. Steam Store.
- Valve Corporation. (2025, June 10). Life on the Edge on Steam. Steam Store.
- Valve Corporation. (2024, September 20). Doomsday Dispute on Steam. Steam Store.