Instanced Dungeons

An instanced dungeon is simply just another game profile that uses matchmaking. The only big difference between normal match-based games and instanced dungeons what happens to the player when the match is over. In match-based games, the server disconnects the player and they're brought back to the main menu, but in instanced dungeons the server transfers the player to a zone in some overworld proxy.

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The RPG Template has an example of instanced dungeons; check it out!