Free Outbreak Sim Games on Steam
Steam currently has 262 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 7/29/2025.
Looking for more? Explore other lists such as:
- Best outbreak sim games on Steam
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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 417 reviews on Steam. This breaks down to a total of 237 positive reviews and 180 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 66, placing it in the #2 spot for the best free Outbreak Sim games. Its score was calculated by analyzing a total of 431 reviews on Steam. This breaks down to a total of 300 positive reviews and 131 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 4,563 reviews on Steam. This breaks down to a total of 4,157 positive reviews and 406 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. 防疫英雄
这是一款休闲益智类游戏。根据经典的PVZ类游戏的核心玩法的基础上，创新题材，创新无尽模式。
防疫英雄 has achieved a Player Score of 60, placing it in the #4 spot for the best free Outbreak Sim games. Its score was calculated by analyzing a total of 89 reviews on Steam. This breaks down to a total of 57 positive reviews and 32 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.
5. 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 60, placing it in the #5 spot for the best free Outbreak Sim games. Its score was calculated by analyzing a total of 4 reviews on Steam. This breaks down to a total of 3 positive reviews and 1 negative reviews — making it "4 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.
6. 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 #6 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 |
7. Desperate ESCAPE
Ted Williams, who has been sheltering in a school bunker for three years after a rocket attack, now has to escape due to a lack of food supplies. To do this, he has to solve his self-constructed puzzles and obstacles that were supposed to prevent him from escaping the bunker.
Desperate ESCAPE has achieved a Player Score of 76, placing it in the #7 spot for the best free Outbreak Sim games. Its score was calculated by analyzing a total of 43 reviews on Steam. This breaks down to a total of 38 positive reviews and 5 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 | 1/8/2024 |
| Developer | CN Entertainment Germany |
| Publisher | CN Entertainment |
| Steam App Id | 2731650 |
8. 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 64, placing it in the #8 spot for the best free Outbreak Sim games. Its score was calculated by analyzing a total of 105 reviews on Steam. This breaks down to a total of 72 positive reviews and 33 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 |
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. 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 60, placing it in the #10 spot for the best free Outbreak Sim games. Its score was calculated by analyzing a total of 7 reviews on Steam. This breaks down to a total of 5 positive reviews and 2 negative reviews — making it "7 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 |
More Free Outbreak Sim Games
Explore even more rankings for the 20 best free Outbreak Sim games available on Steam.
| Image | Name | Actions | ||||
|---|---|---|---|---|---|---|
| 175 | 8/2/2023 | 56 | Free | Steam Charts | |
| 3 | 8/2/2023 | 66 | Free | Steam Charts | |
| 2 | 10/19/2023 | 88 | Free | Steam Charts | |
| 1 | 6/23/2022 | 60 | Free | Steam Charts | |
| 1 | 5/15/2025 | 60 | Free | Steam Charts | |
| 1 | 1/18/2024 | 63 | Free | Steam Charts | |
| 1 | 1/8/2024 | 76 | Free | Steam Charts | |
| 1 | 11/2/2024 | 64 | Free | Steam Charts | |
| 1 | 6/17/2022 | 80 | Free | Steam Charts | |
| 1 | 1/28/2025 | 60 | Free | Steam Charts | |
 | 1 | 5/10/2022 | 78 | Free | Steam Charts | |
 | 1 | 3/10/2023 | 37 | Free | Steam Charts | |
 | 1 | 4/6/2023 | 51 | Free | Steam Charts | |
 | 1 | 2/8/2021 | 79 | Free | Steam Charts | |
 | 1 | 3/7/2024 | 80 | Free | Steam Charts | |
 | 1 | 1/27/2023 | 62 | Free | Steam Charts | |
 | 1 | 12/31/2024 | 60 | Free | Steam Charts | |
 | 1 | 3/17/2021 | 72 | Free | Steam Charts | |
 | 1 | 11/17/2021 | 67 | Free | Steam Charts | |
 | 1 | 8/9/2022 | 67 | 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, July 29). Steam Store. Steam Store.
- Valve Corporation. (2025, July 29). State of Survival on Steam. Steam Store.
- Valve Corporation. (2025, July 12). Post-Apo Builder: Prologue on Steam. Steam Store.
- Valve Corporation. (2025, May 19). Infection Free Zone – Prologue on Steam. Steam Store.
- Valve Corporation. (2025, June 14). 防疫英雄 on Steam. Steam Store.
- Valve Corporation. (2025, August 5). CATpillAr on Steam. Steam Store.
- Valve Corporation. (2025, August 14). Plane Accident: Prologue on Steam. Steam Store.
- Valve Corporation. (2025, June 8). Desperate ESCAPE on Steam. Steam Store.
- Valve Corporation. (2025, July 7). Zombie Siege City on Steam. Steam Store.
- Valve Corporation. (2025, June 10). Life on the Edge on Steam. Steam Store.
- Valve Corporation. (2025, August 14). Final Redoubt: Zombie Apocalypse on Steam. Steam Store.