Free Outbreak Sim Games on Steam
Steam currently has 236 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 3/15/2025.
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- 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 55. Its score was calculated by analyzing a total of 393 reviews on Steam. This breaks down to a total of 222 positive reviews and 171 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. 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 #2 spot for the best free Outbreak Sim games. Its score was calculated by analyzing a total of 4,573 reviews on Steam. This breaks down to a total of 4,164 positive reviews and 409 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 |
3. 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 #3 spot for the best free Outbreak Sim games. Its score was calculated by analyzing a total of 416 reviews on Steam. This breaks down to a total of 289 positive reviews and 127 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 |
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 61, placing it in the #4 spot for the best free Outbreak Sim games. Its score was calculated by analyzing a total of 87 reviews on Steam. This breaks down to a total of 56 positive reviews and 31 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. Outpost Defender 2-Beta
The Space-Outpost is under assault! You must defend it. Fight off infinite waves of alien invaders. Survive as long as possible. A retro/arcade pixel-art outbreak challenge to set the highest score! Single-player and Local Co-Op enabled.
Outpost Defender 2-Beta has achieved a Player Score of 78, placing it in the #5 spot for the best free Outbreak Sim games. Its score was calculated by analyzing a total of 14 reviews on Steam. This breaks down to a total of 14 positive reviews and 0 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 | 5/10/2022 |
| Developer | FluffyPants Games |
| Publisher | FluffyPants Games |
| Steam App Id | 1980520 |
6. 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 81, placing it in the #6 spot for the best free Outbreak Sim games. Its score was calculated by analyzing a total of 51 reviews on Steam. This breaks down to a total of 48 positive reviews and 3 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 |
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 40, placing it in the #7 spot for the best free Outbreak Sim games. Its score was calculated by analyzing a total of 10 reviews on Steam. This breaks down to a total of 3 positive reviews and 7 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. 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 65, placing it in the #8 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 31 positive reviews and 12 negative reviews — making it "Mostly 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 | 1/18/2024 |
| Franchise | Duality Games |
| Developers | |
| Publishers | |
| Steam App Id | 2104670 |
9. 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 #9 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 |
10. 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 59, placing it in the #10 spot for the best free Outbreak Sim games. Its score was calculated by analyzing a total of 1 reviews on Steam. This breaks down to a total of 1 positive reviews and 0 negative reviews — making it "1 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.
More Free Outbreak Sim Games
Explore even more rankings for the 19 best free Outbreak Sim games available on Steam.
| Image | Name | Actions | ||||
|---|---|---|---|---|---|---|
| 241 | 8/2/2023 | 55 | Free | Steam Charts | |
| 6 | 10/19/2023 | 88 | Free | Steam Charts | |
| 3 | 8/2/2023 | 66 | Free | Steam Charts | |
| 1 | 6/23/2022 | 61 | Free | Steam Charts | |
| 1 | 5/10/2022 | 78 | Free | Steam Charts | |
| 1 | 2/9/2021 | 81 | Free | Steam Charts | |
| 1 | 3/10/2023 | 40 | Free | Steam Charts | |
| 1 | 1/18/2024 | 65 | Free | Steam Charts | |
| 1 | 1/28/2025 | 57 | Free | Steam Charts | |
| 1 | 12/31/2024 | 59 | Free | Steam Charts | |
 | 1 | 11/17/2021 | 67 | Free | Steam Charts | |
 | 1 | 1/8/2024 | 77 | Free | Steam Charts | |
 | 1 | 11/2/2024 | 64 | Free | Steam Charts | |
 | 1 | 3/17/2021 | 72 | Free | Steam Charts | |
 | 1 | 1/27/2023 | 62 | Free | Steam Charts | |
 | 1 | 4/7/2023 | 52 | Free | Steam Charts | |
 | 1 | 6/17/2022 | 80 | Free | Steam Charts | |
 | 1 | 3/7/2024 | 79 | Free | Steam Charts | |
 | 1 | 8/9/2022 | 66 | 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, March 15). Steam Store. Steam Store.
- Valve Corporation. (2025, March 15). State of Survival on Steam. Steam Store.
- Valve Corporation. (2025, April 3). Infection Free Zone – Prologue on Steam. Steam Store.
- Valve Corporation. (2025, March 13). Post-Apo Builder: Prologue on Steam. Steam Store.
- Valve Corporation. (2025, March 16). 防疫英雄 on Steam. Steam Store.
- Valve Corporation. (2025, March 18). Outpost Defender 2-Beta on Steam. Steam Store.
- Valve Corporation. (2025, April 4). Cat Colony Crisis on Steam. Steam Store.
- Valve Corporation. (2025, March 25). 丧尸世界-经典策略卡牌养成 on Steam. Steam Store.
- Valve Corporation. (2025, March 30). Plane Accident: Prologue on Steam. Steam Store.
- Valve Corporation. (2025, March 30). Final Redoubt: Zombie Apocalypse on Steam. Steam Store.
- Valve Corporation. (2025, March 23). Icon_survive on Steam. Steam Store.