ID:158951
 
I have seen games that import a save from a single player game in order to unlock things in the multiplayer version, how is this possible?

An example is unlocking a certain character through single player then saving and going to play the multiplayer version. You then would have the unlocked character on the multiplayer version.

PS: I used search but I couldn't find another thread with a similar question.
You'd use a client-side savefile made by the single-player world and read by the remote server to do that.
Alternatively, you could send the data by means of Export() to the remote server from the single-player world, e.g. with a UpdateMultiplayer() verb or automatically when a player saves.