Free Massively Multiplayer Games on Steam
Steam currently has 6,584 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 10/14/2025.
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. 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 holds the #1 spot for "best free Massively Multiplayer game on Steam" with a Player Score of 95. Its score was calculated by analyzing a total of 45,907 reviews on Steam. This breaks down to a total of 44,649 positive reviews and 1,258 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 |
2. 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 has achieved a Player Score of 59, placing it in the #2 spot for the best free Massively Multiplayer games. Its score was calculated by analyzing a total of 150,345 reviews on Steam. This breaks down to a total of 88,633 positive reviews and 61,712 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 |
3. 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 #3 spot for the best free Massively Multiplayer games. Its score was calculated by analyzing a total of 634,337 reviews on Steam. This breaks down to a total of 554,201 positive reviews and 80,136 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 |
4. 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 #4 spot for the best free Massively Multiplayer games. Its score was calculated by analyzing a total of 248,263 reviews on Steam. This breaks down to a total of 187,166 positive reviews and 61,097 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 |
5. 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 #5 spot for the best free Massively Multiplayer games. Its score was calculated by analyzing a total of 668,609 reviews on Steam. This breaks down to a total of 485,792 positive reviews and 182,817 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 |
6. Blue Protocol: Star Resonance
Blue Protocol: Star Resonance expands the Blue Protocol universe with a vibrant MMORPG experience. Create your own hero, team up for strategic raids, or simply relax and have fun with friends fishing, crafting, and endless exploration. Adventure awaits!
Blue Protocol: Star Resonance has achieved a Player Score of 49, placing it in the #6 spot for the best free Massively Multiplayer games. Its score was calculated by analyzing a total of 12,322 reviews on Steam. This breaks down to a total of 6,058 positive reviews and 6,264 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 | 10/9/2025 |
| Developer | Shanghai Bokura Network Technology Co.Ltd |
| Publisher | A Plus |
| Steam App Id | 3681810 |
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 149,606 reviews on Steam. This breaks down to a total of 114,743 positive reviews and 34,863 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. 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 76, placing it in the #8 spot for the best free Massively Multiplayer games. Its score was calculated by analyzing a total of 151,987 reviews on Steam. This breaks down to a total of 115,889 positive reviews and 36,098 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 |
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 14,685 reviews on Steam. This breaks down to a total of 9,590 positive reviews and 5,095 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. Unturned
You're a survivor in the zombie infested ruins of society, and must work with your friends and forge alliances to remain among the living.
Unturned has achieved a Player Score of 90, placing it in the #10 spot for the best free Massively Multiplayer games. Its score was calculated by analyzing a total of 557,969 reviews on Steam. This breaks down to a total of 508,348 positive reviews and 49,621 negative reviews — making it "Very Positive" on Steam.
It can be played and ran on Windows, Mac, and Linux systems. At the moment, it is possible to play Unturned on the Steam Deck (though some functionality may be limited).
| Release Date | 7/7/2017 |
| Developer | Smartly Dressed Games |
| Publisher | Smartly Dressed Games |
| Steam App Id | 304930 |
More Free Massively Multiplayer Games
Explore even more rankings for the 100 best free Massively Multiplayer games available on Steam.
| Image | Name | Actions | ||||
|---|---|---|---|---|---|---|
| 95,986 | 3/5/2025 | 95 | Free | Steam Charts | |
| 80,301 | 12/4/2024 | 59 | Free | Steam Charts | |
| 42,618 | 3/25/2013 | 87 | Free | Steam Charts | |
| 34,493 | 2/1/2017 | 75 | Free | Steam Charts | |
| 27,756 | 8/15/2013 | 72 | Free | Steam Charts | |
| 27,540 | 10/9/2025 | 49 | Free | Steam Charts | |
| 20,511 | 11/15/2017 | 76 | Free | Steam Charts | |
| 16,936 | 7/9/2024 | 76 | Free | Steam Charts | |
| 14,232 | 8/25/2021 | 64 | Free | Steam Charts | |
| 10,516 | 7/7/2017 | 90 | Free | Steam Charts | |
 | 9,673 | 11/11/2021 | 55 | Free | Steam Charts | |
 | 9,189 | 10/1/2019 | 78 | Free | Steam Charts | |
 | 6,863 | 12/9/2022 | 73 | Free | Steam Charts | |
 | 6,466 | 7/17/2025 | 55 | Free | Steam Charts | |
 | 6,376 | 4/2/2021 | 78 | Free | Steam Charts | |
 | 4,760 | 9/19/2025 | 50 | Free | Steam Charts | |
 | 4,595 | 5/16/2018 | 78 | Free | Steam Charts | |
 | 4,177 | 4/29/2021 | 80 | Free | Steam Charts | |
 | 3,001 | 11/9/2016 | 78 | Free | Steam Charts | |
 | 2,886 | 10/23/2013 | 88 | 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, October 14). Steam Store. Steam Store.
- Valve Corporation. (2025, October 14). Bongo Cat on Steam. Steam Store.
- Valve Corporation. (2025, October 20). Delta Force on Steam. Steam Store.
- Valve Corporation. (2025, October 19). Warframe on Steam. Steam Store.
- Valve Corporation. (2025, October 17). VRChat on Steam. Steam Store.
- Valve Corporation. (2025, October 18). War Thunder on Steam. Steam Store.
- Valve Corporation. (2025, October 20). Blue Protocol: Star Resonance on Steam. Steam Store.
- Valve Corporation. (2025, October 15). World of Warships on Steam. Steam Store.
- Valve Corporation. (2025, October 19). Once Human on Steam. Steam Store.
- Valve Corporation. (2025, October 14). MIR4 on Steam. Steam Store.
- Valve Corporation. (2025, October 17). Unturned on Steam. Steam Store.