Subnautica 2 supports up to four players in co-op multiplayer mode without needing to use mods. You are also able to play the entire game solo.
1. How Subnautica 2 Co-Op Multiplayer Works
Friends list supports cross-platform co-op
A pre-launch dev log revealed that multiplayer is optional, although all gameplay features are designed to be functional with online co-op. If you want to play with a friend, open the Join Friends menu and click on Join under the Action column.
- Number of Players in Co-Op: 1 to 4 players
- Cross-Platform: Yes
- Local Split Screen: No
- Online Play With Friends: Yes
- In-Game Friends List: Yes
Unknown Worlds Entertainment also confirmed that you can convert your single-player save for co-op or start a new save altogether.
Does Early Access Include Multiplayer?
Note that some countries gain access on May 15, 2026
Yes, Early Access has already been known to include optional co-op. Players can invite up to three friends to join them on Windows PC and Xbox Series X|S.
- Subnautica 2 Co-Op Release Date: Developers confirmed that you can play with your friends on launch day (May 14, 2026).
- Cross-Platform Support: Early Access will have crossplay between different platforms.
- Playable Characters: There will be four pre-designed characters at launch, with more customization options available later in the game’s development.
- Promised Features in Early Access: This game’s Early Access features several explorable biomes, lore, craftable items, and various creatures to find with your friends.
2. Can You Play Subnautica 2 Solo?
Beating this game by yourself is 100% possible
Yes, this game is designed to be beaten from start to finish as a solo player, similar to the previous titles in the Subnautica series.
- Single-Player Focus: All major content is available in what the developers call “crafted as a single-player experience.”
- No Multiplayer Puzzles: Developers confirmed in their dev log that no puzzles require multiple players, such as having to activate multiple switches in tandem.
