Navigate to Play > Multiplayer > Host Game to create a lobby for up to 8 players.
On PC, you can download community-created maps by visiting the Steam Workshop and clicking the "+" button to subscribe to new levels. Human: Fall Flat v1082172
Advanced players can create and test their own levels using tools like Unity, then export them directly into the game's "Local Levels" menu. If you are looking for specific help, let me know: Navigate to Play > Multiplayer > Host Game
The standard game includes 30 levels, ranging from mansions and castles to industrial zones. Human: Fall Flat v1082172
Are you trying to set up on a specific platform like PC or console?