Free Massively Multiplayer Games on Steam
Steam currently has 6,538 Massively Multiplayer 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 Massively Multiplayer game rankings were last updated on 9/27/2025.
Looking for more? Explore other lists such as:
- Best massively multiplayer games on Steam
- Best massively multiplayer Steam Deck games
- Best massively multiplayer Steam games for Mac OS
- Best massively multiplayer Linux games on Steam
- Free Steam games
- Most played Steam games
- Best rated Steam games
1. Delta Force
Delta Force, a free-to-play 1st-person tactical shooter, returns as the latest in the classic series. With 25 years defining the genre, Delta Force is back with an upgraded arsenal of weaponry, jaw-dropping environments, and a truly dynamic world.
Delta Force holds the #1 spot for "best free Massively Multiplayer game on Steam" with a Player Score of 60. Its score was calculated by analyzing a total of 142,554 reviews on Steam. This breaks down to a total of 86,474 positive reviews and 56,080 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 Delta Force on the Steam Deck.
| Release Date | 12/4/2024 |
| Developers | |
| Publisher | TiMi Studio Group |
| Steam App Id | 2507950 |
2. Bongo Cat
Bongo cat needs your help. Bongo cat needz more hatz!!! Every time you press a key, Bongo cat will punch your taskbar. Type, click, play, work to collect more points. Which hats will you find?
Bongo Cat has achieved a Player Score of 96, placing it in the #2 spot for the best free Massively Multiplayer games. Its score was calculated by analyzing a total of 42,020 reviews on Steam. This breaks down to a total of 40,953 positive reviews and 1,067 negative reviews — making it "Overwhelmingly 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 | 3/5/2025 |
| Developers | |
| Publisher | Irox Games |
| Steam App Id | 3419430 |
3. War Thunder
War Thunder is the most comprehensive free-to-play, cross-platform, MMO military game dedicated to aviation, armoured vehicles, and naval craft, from the early 20th century to the most advanced modern combat units. Join now and take part in major battles on land, in the air, and at sea.
War Thunder has achieved a Player Score of 72, placing it in the #3 spot for the best free Massively Multiplayer games. Its score was calculated by analyzing a total of 662,526 reviews on Steam. This breaks down to a total of 481,799 positive reviews and 180,727 negative reviews — making it "Mostly Positive" on Steam.
It can be played and ran on Windows, Mac, and Linux systems. Valve has also verified it as playable on the Steam Deck and will run well.
| Release Date | 8/15/2013 |
| Franchise | Gaijin Network Ltd |
| Developer | Gaijin Entertainment |
| Publishers | |
| Steam App Id | 236390 |
4. Warframe
Awaken as an unstoppable warrior and battle alongside your friends in this story-driven free-to-play online action game
Warframe has achieved a Player Score of 87, placing it in the #4 spot for the best free Massively Multiplayer games. Its score was calculated by analyzing a total of 631,369 reviews on Steam. This breaks down to a total of 552,484 positive reviews and 78,885 negative reviews — making it "Very Positive" on Steam.
It can be played and ran on Windows systems. Valve has also verified it as playable on the Steam Deck and will run well.
| Release Date | 3/25/2013 |
| Developer | Digital Extremes |
| Publisher | Digital Extremes |
| Steam App Id | 230410 |
5. VRChat
Join our growing community as you explore, play, and help craft the future of social VR. Create worlds and custom avatars. Welcome to VRChat.
VRChat has achieved a Player Score of 75, placing it in the #5 spot for the best free Massively Multiplayer games. Its score was calculated by analyzing a total of 247,161 reviews on Steam. This breaks down to a total of 186,353 positive reviews and 60,808 negative reviews — making it "Mostly Positive" on Steam.
It can be played and ran on Windows systems. Valve has also verified it as playable on the Steam Deck and will run well.
| Release Date | 2/1/2017 |
| Developer | VRChat Inc. |
| Publisher | VRChat Inc. |
| Steam App Id | 438100 |
6. Once Human
Once Human is a multiplayer open-world survival game set in a strange, post-apocalyptic future. Unite with friends to fight monstrous enemies, uncover secret plots, compete for resources, and build your own territory. Once, you were merely human. Now, you have the power to remake the world.
Once Human has achieved a Player Score of 75, placing it in the #6 spot for the best free Massively Multiplayer games. Its score was calculated by analyzing a total of 148,428 reviews on Steam. This breaks down to a total of 112,566 positive reviews and 35,862 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 Once Human on the Steam Deck.
| Release Date | 7/9/2024 |
| Developer | Starry Studio |
| Publisher | Starry Studio |
| Steam App Id | 2139460 |
7. World of Warships
Immerse yourself in thrilling naval battles and assemble an armada of over 600 ships from the first half of the 20th century — from stealthy destroyers to gigantic battleships. Change the look of your ship, choose upgrades to suit your play style, and go into battle with other players!
World of Warships has achieved a Player Score of 76, placing it in the #7 spot for the best free Massively Multiplayer games. Its score was calculated by analyzing a total of 149,131 reviews on Steam. This breaks down to a total of 114,419 positive reviews and 34,712 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 World of Warships on the Steam Deck (though some functionality may be limited).
| Release Date | 11/15/2017 |
| Franchise | World of Warships Franchise |
| Developer | Wargaming Group Limited |
| Publisher | Wargaming Group Limited |
| Steam App Id | 552990 |
8. Russian Fishing 4
Russian Fishing 4 is a fishing simulator with RPG elements. There is no story line and the whole process is based on the concept of an open, free to roam and free to play game.
Russian Fishing 4 has achieved a Player Score of 55, placing it in the #8 spot for the best free Massively Multiplayer games. Its score was calculated by analyzing a total of 77,034 reviews on Steam. This breaks down to a total of 42,663 positive reviews and 34,371 negative reviews — making it "Mixed" on Steam.
It can be played and ran on Windows systems. At the moment, it is possible to play Russian Fishing 4 on the Steam Deck (though some functionality may be limited).
| Release Date | 11/11/2021 |
| Developers | |
| Publishers | |
| Steam App Id | 766570 |
9. MIR4
MIR4 is a free-to-play open world K-fantasy MMORPG that can be cross-played on both PC and mobile devices. MIR4 is full of action and features numerous large scale clan PVP battles. Join now and become a legend.
MIR4 has achieved a Player Score of 64, placing it in the #9 spot for the best free Massively Multiplayer games. Its score was calculated by analyzing a total of 14,664 reviews on Steam. This breaks down to a total of 9,577 positive reviews and 5,087 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 MIR4 on the Steam Deck.
| Release Date | 8/25/2021 |
| Developer | Wemade Next |
| Publisher | Wemade |
| Steam App Id | 1623660 |
10. World of Tanks
World of Tanks is a tactical action game with very different gameplay depending on the vehicle type and role. Aside from regular PvP, there are competitive and clan-based modes, special PvE and PvPvE events, and much more. Whether you play to dominate or just enjoy the ride, you'll fit right in.
World of Tanks has achieved a Player Score of 81, placing it in the #10 spot for the best free Massively Multiplayer games. Its score was calculated by analyzing a total of 91,549 reviews on Steam. This breaks down to a total of 74,793 positive reviews and 16,756 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 World of Tanks on the Steam Deck (though some functionality may be limited).
| Release Date | 4/29/2021 |
| Franchise | Wargaming Group Ltd. |
| Developer | Wargaming Group Limited |
| Publisher | Wargaming Group Limited |
| Steam App Id | 1407200 |
More Free Massively Multiplayer Games
Explore even more rankings for the 100 best free Massively Multiplayer games available on Steam.
| Image | Name | Actions | ||||
|---|---|---|---|---|---|---|
| 236,086 | 12/4/2024 | 60 | Free | Steam Charts | |
| 123,361 | 3/5/2025 | 96 | Free | Steam Charts | |
| 84,408 | 8/15/2013 | 72 | Free | Steam Charts | |
| 51,523 | 3/25/2013 | 87 | Free | Steam Charts | |
| 50,465 | 2/1/2017 | 75 | Free | Steam Charts | |
| 36,066 | 7/9/2024 | 75 | Free | Steam Charts | |
| 23,829 | 11/15/2017 | 76 | Free | Steam Charts | |
| 17,864 | 11/11/2021 | 55 | Free | Steam Charts | |
| 16,022 | 8/25/2021 | 64 | Free | Steam Charts | |
| 14,571 | 4/29/2021 | 81 | Free | Steam Charts | |
 | 14,550 | 7/7/2017 | 90 | Free | Steam Charts | |
 | 14,101 | 10/3/2021 | 85 | Free | Steam Charts | |
 | 13,028 | 12/9/2022 | 73 | Free | Steam Charts | |
 | 11,514 | 9/19/2025 | 54 | Free | Steam Charts | |
 | 10,793 | 5/16/2018 | 78 | Free | Steam Charts | |
 | 8,224 | 11/9/2016 | 78 | Free | Steam Charts | |
 | 8,176 | 4/2/2021 | 78 | Free | Steam Charts | |
 | 7,474 | 10/23/2013 | 88 | Free | Steam Charts | |
 | 6,176 | 8/23/2022 | 87 | Free | Steam Charts | |
 | 5,783 | 4/6/2020 | 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, September 27). Steam Store. Steam Store.
- Valve Corporation. (2025, September 27). Delta Force on Steam. Steam Store.
- Valve Corporation. (2025, September 21). Bongo Cat on Steam. Steam Store.
- Valve Corporation. (2025, September 26). War Thunder on Steam. Steam Store.
- Valve Corporation. (2025, September 20). Warframe on Steam. Steam Store.
- Valve Corporation. (2025, September 25). VRChat on Steam. Steam Store.
- Valve Corporation. (2025, September 27). Once Human on Steam. Steam Store.
- Valve Corporation. (2025, September 25). World of Warships on Steam. Steam Store.
- Valve Corporation. (2025, August 27). Russian Fishing 4 on Steam. Steam Store.
- Valve Corporation. (2025, September 24). MIR4 on Steam. Steam Store.
- Valve Corporation. (2025, September 22). World of Tanks on Steam. Steam Store.