What'Sub
Khaos Games · 2026 · Multiplayer, Procedural Generation, Adventure, Online Co-Op, Co-op
PC
Mostly Positive71% · 35 📈 Making a comeback 80%
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About What'Sub
What'Sub is a 1–4 player co-op extraction diver where you crew a rust-bucket submarine, descend into the Bermuda Triangle, and decide how deep your greed actually goes.
Descend into "The Well"
Navigate caverns, wrecks, and treacherous terrain. Visibility is limited. Hazards appear late. The deeper you go, the more long-lost treasure waits and the harder it gets to leave.Risk It or Lose It
Make it back to the surface with your haul and keep everything: loot, upgrades, progress. Drown down there and lose everything you brought in. Every dive is a negotiation between what you stand to gain and what you're willing to gamble.Keep the Sub Running
The sub breaks down constantly, at the worst possible moment, for the least forgivable reason. Hull breaches, a stalled engine; the list of things that can go wrong is longer than the list of things working correctly. Patch it, smack it, restart it, and keep moving. It's not much, but it's all you've got.The Ocean Never Repeats Itself
Procedurally generated levels mean no two dives are the same. There's always something new to discover and always a reason to go back down.Strange Faces at the Bottom
The Well has its own residents. Meet the characters that call the deep home, buy cosmetics, and pry secrets about the Well out of the ones willing to talk.FeaturesOnline co-op for up to four playersExtraction mechanics with full loot loss on deathInterdependent submarine systems and crew rolesCharacters, cosmetics, and a customizable submarineProcedurally generated ocean levels
What Steam players say
Recent verbatim reviews from Steam — separate from playze.io community reviews below.
REDUCED BUILD SIZE BY 70%. Call this dev team the optimisers. My early impressions are that this team is quickly working towards improvements and adding fun silly things into the game. I've only seen the difference since last patch but small things like improvement to the ui are noticed and greatly appreciated. Even small game balancing to come closer to a specific vision that the devs wish to achieve gives me great faith in the team. The fans in the base to move around? Brilliant. When fishing (and combat with those pesky crabs) gets implemented, we will truly be gaming. Future looks bright.2 found this helpful
Can easily get out of bounds in the hub. 10/10 even after they patched my old path, theres always new ones. Otherwise, this is a game with promise. The gameplay loop is similar to very early Sea of Thieves, just under the water, so its a formula thats already proven to be good. And heres a decent Indie game attempt at solving it. Would recommend for people with 1-2 friends that can play.1 found this helpful
Had a great time exploring the oceans with my friend. Couldn't hook those pearls for my life! Also, the Hub-world was so cozy! Loving these NPC designs.
Seeing how quickly the devs are fixing things is think the game has a lot of potential. Was quite fun, will be playing more of it!
Fun simple little game.
Very fun friend-slop game! Met the devs at Gamebox and won a copy of the game. Really looking forward to seeing it "fully" finished, it's already very pretty
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