Free Underwater Games on Steam
Steam currently has 857 Underwater 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 Underwater game rankings were last updated on 4/3/2026.
Looking for more? Explore other lists such as:
- Best underwater games on Steam
- Best underwater Steam Deck games
- Best underwater Steam games for Mac OS
- Best underwater Linux games on Steam
- Free Steam games
- Most played Steam games
- Best rated Steam games
1. Shrimp.io
A Shrimp Based Bullet Heaven. Kill creatures, Level up & pick from 3 upgrades to unalive thousands more.
Shrimp.io holds the #1 spot for "best free Underwater game on Steam" with a Player Score of 78. Its score was calculated by analyzing a total of 262 reviews on Steam. This breaks down to a total of 221 positive reviews and 41 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 Shrimp.io on the Steam Deck (though some functionality may be limited).
2. FincrementalOS
Blast away with a submarine’s cannon and sort your desktop for minigames in this incremental fish shooting and simulated operating system hybrid!
FincrementalOS has achieved a Player Score of 71, placing it in the #2 spot for the best free Underwater games. Its score was calculated by analyzing a total of 5 reviews on Steam. This breaks down to a total of 5 positive reviews and 0 negative reviews — making it "5 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 | 5/1/2026 |
| Developer | Calamafia Studio |
| Publishers | |
| Steam App Id | 4408540 |
3. Pearls of Atlantis: The Cove
Color match in a whole new way! Drop, pop, swap and match magic pearls to collect the charms inside and rebuild the hidden Cove of Memories!
Pearls of Atlantis: The Cove has achieved a Player Score of 69, placing it in the #3 spot for the best free Underwater games. Its score was calculated by analyzing a total of 46 reviews on Steam. This breaks down to a total of 36 positive reviews and 10 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 Pearls of Atlantis: The Cove on the Steam Deck (though some functionality may be limited).
| Release Date | 2/15/2024 |
| Developer | Alder Games |
| Publisher | Legacy Games |
| Steam App Id | 2678160 |
4. Water Womb World
Aqua Catholicism; Explore Man's Original Sin Under The Sea
Water Womb World has achieved a Player Score of 88, placing it in the #4 spot for the best free Underwater games. Its score was calculated by analyzing a total of 192 reviews on Steam. This breaks down to a total of 187 positive reviews and 5 negative reviews — making it "Very 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 | 2/24/2026 |
| Developers | |
| Publishers | |
| Steam App Id | 4014680 |
5. Dread Not
Avoid your watery grave in this asymmetrical co-op horror game where you and a friend take the roles of a submarine Pilot and Mechanic. Work together to repair the ship, solve puzzles, avoid a deadly creature, and make it back to the surface before time runs out! It's time to Sync or Swim
Dread Not has achieved a Player Score of 46, placing it in the #5 spot for the best free Underwater games. Its score was calculated by analyzing a total of 526 reviews on Steam. This breaks down to a total of 237 positive reviews and 289 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 | 6/15/2025 |
| Developer | Leviathan Interactive |
| Publisher | Leviathan Interactive |
| Steam App Id | 3616560 |
6. 疯狂炮炮捕鱼
超爽福利版《疯狂炮炮捕鱼》闪亮登场，经典捕鱼玩法，十万倍率满屏BOSS，金币狂爆不停。每天送金币，每周有活动，创意捕鱼玩法，升级养成分数比拼一战到底。
疯狂炮炮捕鱼 has achieved a Player Score of 66, placing it in the #6 spot for the best free Underwater games. Its score was calculated by analyzing a total of 424 reviews on Steam. This breaks down to a total of 295 positive reviews and 129 negative reviews — making it "Mixed" on Steam.
It can be played and ran on Windows systems. At the moment, it is possible to play 疯狂炮炮捕鱼 on the Steam Deck (though some functionality may be limited).
7. Sync Or Sink
Trapped in a sinking submarine, two players must communicate through walkie-talkies to solve puzzles, complete tasks, navigate the depths, and escape before time runs out.
Sync Or Sink has achieved a Player Score of 82, placing it in the #7 spot for the best free Underwater games. Its score was calculated by analyzing a total of 136 reviews on Steam. This breaks down to a total of 124 positive reviews and 12 negative reviews — making it "Very 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 | 10/1/2025 |
| Developer | Low Effort Interactive |
| Publisher | Low Effort Interactive |
| Steam App Id | 3626910 |
8. Desktank
A cozy idle aquarium that lives on top of your screen. Watch fish swim, grow, and interact while you work or relax. Desktank turns your desktop into a peaceful underwater world — float it in the corner or let it take over the whole screen. Just sit back and enjoy the calm.
Desktank has achieved a Player Score of 75, placing it in the #8 spot for the best free Underwater games. Its score was calculated by analyzing a total of 34 reviews on Steam. This breaks down to a total of 30 positive reviews and 4 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 | 6/3/2025 |
| Developers | |
| Publishers | |
| Steam App Id | 2722730 |
9. Together in Forgotten Lands: Chapter One
Two souls, one destiny. Embark on a co-op adventure through a forgotten land, where teamwork and wit are the only way to navigate the wonders and dangers of a magical cave.
Together in Forgotten Lands: Chapter One has achieved a Player Score of 82, placing it in the #9 spot for the best free Underwater games. Its score was calculated by analyzing a total of 202 reviews on Steam. This breaks down to a total of 181 positive reviews and 21 negative reviews — making it "Very 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 | 8/18/2025 |
| Developer | Vellichor Games |
| Publisher | Vellichor Games |
| Steam App Id | 3723610 |
10. Revenge of the Killer Octopus
Revenge of the Killer Octopus is a third-octopus game where you shoot and possess your way through throes of enraged scientists in order to take your revenge!
Revenge of the Killer Octopus has achieved a Player Score of 70, placing it in the #10 spot for the best free Underwater games. Its score was calculated by analyzing a total of 81 reviews on Steam. This breaks down to a total of 63 positive reviews and 18 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 | 11/16/2022 |
| Developer | Messy Bed Productions |
| Publisher | Messy Bed Productions |
| Steam App Id | 1906640 |
More Free Underwater Games
Explore even more rankings for the 100 best free Underwater games available on Steam.
| Image | Name | Actions | ||||
|---|---|---|---|---|---|---|
| 66 | 2/13/2024 | 78 | Free | Steam Charts | |
| 7 | 5/1/2026 | 71 | Free | Steam Charts | |
| 6 | 2/15/2024 | 69 | Free | Steam Charts | |
| 3 | 2/24/2026 | 88 | Free | Steam Charts | |
| 2 | 6/15/2025 | 46 | Free | Steam Charts | |
| 2 | 10/22/2021 | 66 | Free | Steam Charts | |
| 2 | 10/1/2025 | 82 | Free | Steam Charts | |
| 2 | 6/3/2025 | 75 | Free | Steam Charts | |
| 2 | 8/18/2025 | 82 | Free | Steam Charts | |
| 1 | 11/16/2022 | 70 | Free | Steam Charts | |
 | 1 | 4/5/2023 | 76 | Free | Steam Charts | |
 | 1 | 9/12/2024 | 78 | Free | Steam Charts | |
 | 1 | 8/28/2022 | 58 | Free | Steam Charts | |
 | 1 | 5/9/2022 | 71 | Free | Steam Charts | |
 | 1 | 2/10/2021 | 59 | Free | Steam Charts | |
 | 1 | 5/6/2022 | 71 | Free | Steam Charts | |
 | 1 | 1/23/2024 | 73 | Free | Steam Charts | |
 | 1 | 11/16/2022 | 60 | Free | Steam Charts | |
 | 1 | 11/1/2021 | 72 | Free | Steam Charts | |
 | 1 | 8/25/2025 | 81 | 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. (2026, April 3). Steam Store. Steam Store.
- Valve Corporation. (2026, April 3). Shrimp.io on Steam. Steam Store.
- Valve Corporation. (2026, May 2). FincrementalOS on Steam. Steam Store.
- Valve Corporation. (2026, April 15). Pearls of Atlantis: The Cove on Steam. Steam Store.
- Valve Corporation. (2026, April 29). Water Womb World on Steam. Steam Store.
- Valve Corporation. (2026, April 5). Dread Not on Steam. Steam Store.
- Valve Corporation. (2024, September 22). 疯狂炮炮捕鱼 on Steam. Steam Store.
- Valve Corporation. (2026, April 3). Sync Or Sink on Steam. Steam Store.
- Valve Corporation. (2026, April 20). Desktank on Steam. Steam Store.
- Valve Corporation. (2026, April 3). Together in Forgotten Lands: Chapter One on Steam. Steam Store.
- Valve Corporation. (2026, March 29). Revenge of the Killer Octopus on Steam. Steam Store.