PlayStandalone => Test functions of your menu / functions for creating or finding a session. You are using Standalone here because you don’t have a session yet (no server, no client).
PlayAsListenServer => Test functions as the server (you are in a session)
PlayAsClient => Test functions as the client (you are in a session)
The last two methods are for testing the server/client interactions, replication, etc. when you are in a session and have a map to play in (lobby map, gameplay map). The first one will let you use every seperate game window as a standalone game to test your functions independent from each other.
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