In Utopia, you will find a door which requires two entrance keys to unlock.
To get the keys, you have to first complete a series of puzzles.
Here’s how you can get the entrance keys for Utopia in Raft.
First entrance key
The first entrance key doesn’t require any puzzles. Just look for the building with a unique door that requires a master key.
Go towards the door and you should see the entrance key on the steps. Just pick it up.
Second entrance key
The second entrance key is at the building with “X” marked on the wall.
Before you can get to that building, you need to find the harpoon and carbon dioxide canister.
Use the device at the top of the building to shoot the harpoon and zipline into the building with the “X”.
Inside, you’ll find the entrance key on the table.
Then, zipline to the next building.
Use the 2 entrance keys to open the locks.