Sufficient money
Online method: Enter the game and click the globe icon in the lower right corner > Multiplayer mode > Create a room or join > Change server and select another server > Return and click to join > Wait for the room to be refreshed > Join the room.
Just wait for the landlord's consent (if you can't refresh the room, repeat the steps to choose another server)
this game requires scientific Internet access, and you can restart it several times if the progress is stuck.