If you’ve spent hours scouring the eerie alien oceans of the original Subnautica, you’ve probably daydreamed about bringing friends along for the ride. The long-awaited follow-up builds on everything players loved about the first game, from terrifying leviathan encounters to sprawling hidden alien ruins, and adds the most requested feature of all: full native co-op support. The original had no official multiplayer options, so fans have been waiting years to explore the new 4546B map with their crew. But before you round up your gaming group, you’re likely wondering Subnautica 2 multiplayer how many players can fit in a single lobby, and whether there are ways to adjust those limits to fit your group size. I’ve spent the past two weeks testing co-op sessions across PC, PS5, and Xbox Series X/S, and I’ve broken down all the official and unofficial player limits, plus tips to keep your runs stable no matter how many people you bring along.
Official Subnautica 2 Multiplayer: How Many Players Are Supported By Default?
Unknown Worlds, the studio behind the Subnautica franchise, has confirmed that the base, unmodded version of the game supports a maximum of 4 players per lobby across all platforms. This limit is the same for PC, PlayStation, and Xbox, and works with full crossplay enabled, so you can play with friends no matter what system they own. If you’re looking for a casual, glitch-free experience, the answer to Subnautica 2 multiplayer how many players you can bring is simple: stick to the official 4 player cap.
The studio didn’t pick this number randomly. The 4 player limit is designed to preserve the core survival tension the franchise is known for. With 4 people, you can split up to fill clear roles: one player can gather building resources, one can scout for leviathan spawns and new biomes, one can cook food and manage water supplies, and one can research new crafting recipes. More than that, and resource scarcity becomes a non-issue, removing a lot of the challenge of surviving on a hostile alien planet. Vanilla lobbies have a hard cap of 4 players across all platforms, with no official way to raise this limit in the base game.
I tested the default 4 player setup with three friends last week, and we had zero latency or desync issues even when we were all exploring separate biomes 2km apart from each other. The only minor glitch we ran into was a single instance of a harvested mineral not showing up in one player’s inventory, which fixed itself after a quick lobby restart. For most players, the default limit will be more than enough for a fun, balanced run.
Unofficial Modded Lobby Limits For PC Players
If you have a larger group and only play on PC, you don’t have to stick to the 4 player cap. The Subnautica modding community has already released several free mods that let you raise the maximum player limit for custom lobbies. The most popular mod as of right now lets you host lobbies with up to 16 players, though that number comes with a lot of caveats you need to know before you install it.
I tested the 16 player mod with a large group of fellow survival game fans last month, and while it was chaotic fun for a couple of hours, we ran into consistent performance issues once we passed 8 players. Base building started glitching, resources would disappear after being picked up, and leviathans would spawn in the wrong biomes for half the lobby. By the time we had 12 people online, we were crashing every 15 minutes or so. Before you decide to use a modded lobby, keep these key considerations in mind:
- All players in the lobby need to have the exact same mod version installed to avoid desync or instant crashes when joining
- Modded lobbies do not support crossplay, so all players must be on PC to join, even if they own the game on console
- You will lose access to official achievement progression while playing in a modded lobby, so save modded runs for casual play after you’ve beaten the main story
- Performance drops significantly once you pass 8 players, even on high-end PC builds with 32GB of RAM and top-tier internet connections
If you’re only looking to add one or two extra players, the 5-8 player range is almost as stable as the default vanilla setup, in my experience. I’ve run multiple 6 player modded sessions with no crashes at all, as long as everyone has the mod installed correctly and the host has a stable fiber internet connection.
How To Optimize Your Multiplayer Session For Any Group Size
No matter how many players you’re playing with, there are simple steps you can take to cut down on glitches, desync, and crashes. Most common co-op issues come down to the host’s connection or conflicting render loads across multiple players, so fixing those two things will solve 90% of your problems.
For default 4 player lobbies, you barely need to do any optimization at all. Just make sure the host has at least 10Mbps upload speed, and turn off any background downloads or streaming apps on the host’s device while you play. If you’re running a modded 5-8 player lobby, the host should have at least 16GB of RAM, and all players should turn down their shadow and water reflection settings to medium to reduce render load. The biggest cause of co-op crashes is multiple players loading high-detail biomes at the same time, so stagger your exploration trips if you’re playing with a larger group.
For 9+ player modded lobbies, you’ll need to set some ground rules to keep the game running. Assign one player as a dedicated base manager who doesn’t leave the main base for long stretches, so the host’s render distance stays focused on one central area. Limit exploration groups to 2-3 players at a time, and avoid having more than 10 people online at the same time if you want to avoid regular crashes. If you’re playing with new players, stick to the default 4 player limit for your first 2-3 runs to learn the game mechanics before you add more people. Too many players early on can make the game feel overwhelming, and new players won’t get a chance to learn how to survive on their own.
Is There A Recommended Player Count For Different Playstyles?
The “best” player count for your run depends entirely on what you want to get out of the game. The 4 player default works for most people, but you might want to adjust it up or down depending on how you like to play.
For casual story-focused runs, I recommend 2-3 players. This lets you take your time exploring and finding story clues, without having to coordinate a huge group. I did my first full story run with my partner, and it was the perfect size: we could split up to find clues, but we still had each other’s backs when we ran into a Ghost Leviathan in the deep biomes. You don’t have to worry about anyone getting left behind, and you can progress at your own pace without rushing.
For challenge runs, like hardcore mode or no-base-building runs, stick to the 4 player max. More than that makes the challenge trivial, because you have too many people gathering resources and watching for threats. Hardcore mode lobbies should never have more than 4 players, as modded lobbies have a higher risk of crashing which can delete your permanent save file. There’s nothing worse than losing a 20-hour hardcore run because a mod glitch crashed your lobby, so keep modded play separate from your serious challenge runs.
For creative mode base building, you can go up to 8 modded players without any major issues. You don’t have to worry about survival mechanics, so desync and glitches are far less annoying, and you can build massive, elaborate underwater bases together with your whole friend group. I’ve run 7 player creative sessions where we built a full underwater research facility spanning three biomes, and we only had one minor glitch the entire time.
At the end of the day, the right player count for your run depends entirely on what you want to get out of the game. The default 4 player limit is there for a reason, and it works perfectly for 90% of players who want a balanced, stable co-op experience. If you have a larger group and don’t mind dealing with occasional glitches, modded lobbies let you push that limit much higher. No matter what size group you’re playing with, the core joy of exploring those eerie, beautiful alien oceans doesn’t fade, whether you’re alone or with a whole crew of friends. Now that you know the answer to Subnautica 2 multiplayer how many players can join your lobby, all that’s left is to round up your group, stock up on first aid kits, and dive in.
