Free Outbreak Sim Games on Steam
Steam currently has 290 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 12/15/2025.
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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 440 reviews on Steam. This breaks down to a total of 251 positive reviews and 189 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 432 reviews on Steam. This breaks down to a total of 298 positive reviews and 134 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. 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 #3 spot for the best free Outbreak Sim games. Its score was calculated by analyzing a total of 44 reviews on Steam. This breaks down to a total of 39 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 |
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 90 reviews on Steam. This breaks down to a total of 58 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. 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 #5 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 | 3/9/2023 |
| Developer | 团队集结，决战末日巅峰 |
| Publisher | 官方QQ群：873997466 |
| Steam App Id | 2264970 |
6. 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 #6 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.
7. 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 72, placing it in the #7 spot for the best free Outbreak Sim games. Its score was calculated by analyzing a total of 12 reviews on Steam. This breaks down to a total of 11 positive reviews and 1 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 |
8. Collapsed
Challenge your mind with a 3D physics-based puzzle game. Take control of a cannon and use your limited supply of cannonballs to bring each level crashing to the ground. Using gravity, momentum, and logic, plan how to knock down each structure and leave nothing standing after the collapse!
Collapsed has achieved a Player Score of 68, placing it in the #8 spot for the best free Outbreak Sim games. Its score was calculated by analyzing a total of 27 reviews on Steam. This breaks down to a total of 21 positive reviews and 6 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.
9. 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 #9 spot for the best free Outbreak Sim games. Its score was calculated by analyzing a total of 4,554 reviews on Steam. This breaks down to a total of 4,147 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 |
10. 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 #10 spot for the best free Outbreak Sim games. Its score was calculated by analyzing a total of 54 reviews on Steam. This breaks down to a total of 50 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 | 2/8/2021 |
| Developer | Devil's Cider Games |
| Publisher | Devil's Cider Games |
| Steam App Id | 1516760 |
More Free Outbreak Sim Games
Explore even more rankings for the 22 best free Outbreak Sim games available on Steam.
| Image | Name | Actions | ||||
|---|---|---|---|---|---|---|
| 83 | 8/2/2023 | 56 | Free | Steam Charts | |
| 2 | 8/2/2023 | 66 | Free | Steam Charts | |
| 2 | 1/8/2024 | 76 | Free | Steam Charts | |
| 1 | 6/22/2022 | 61 | Free | Steam Charts | |
| 1 | 3/9/2023 | 39 | Free | Steam Charts | |
| 1 | 5/15/2025 | 60 | Free | Steam Charts | |
| 1 | 9/9/2025 | 72 | Free | Steam Charts | |
| 1 | 8/9/2022 | 68 | Free | Steam Charts | |
| 1 | 10/19/2023 | 88 | Free | Steam Charts | |
| 1 | 2/8/2021 | 80 | Free | Steam Charts | |
 | 1 | 3/7/2024 | 80 | Free | Steam Charts | |
 | 1 | 5/10/2022 | 79 | Free | Steam Charts | |
 | 1 | 4/6/2023 | 54 | Free | Steam Charts | |
 | 1 | 3/17/2021 | 71 | Free | Steam Charts | |
 | 1 | 11/2/2024 | 61 | Free | Steam Charts | |
 | 1 | 11/17/2021 | 67 | Free | Steam Charts | |
 | 1 | 8/23/2021 | 72 | Free | Steam Charts | |
 | 1 | 6/17/2022 | 80 | Free | Steam Charts | |
 | 1 | 12/31/2024 | 63 | Free | Steam Charts | |
 | 1 | 1/27/2023 | 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. (2025, December 15). Steam Store. Steam Store.
- Valve Corporation. (2025, December 15). State of Survival on Steam. Steam Store.
- Valve Corporation. (2026, January 1). Post-Apo Builder: Prologue on Steam. Steam Store.
- Valve Corporation. (2025, October 10). Desperate ESCAPE on Steam. Steam Store.
- Valve Corporation. (2025, September 27). 防疫英雄 on Steam. Steam Store.
- Valve Corporation. (2025, December 30). 丧尸世界-经典策略卡牌养成 on Steam. Steam Store.
- Valve Corporation. (2025, November 1). CATpillAr on Steam. Steam Store.
- Valve Corporation. (2025, December 27). The Crawling Dead on Steam. Steam Store.
- Valve Corporation. (2026, January 9). Collapsed on Steam. Steam Store.
- Valve Corporation. (2025, May 19). Infection Free Zone – Prologue on Steam. Steam Store.
- Valve Corporation. (2025, October 1). Cat Colony Crisis on Steam. Steam Store.