Anarchy Online's instanced playfields.
"Anarchy Online was the first to use instances. They are the creators of this technology and plan on using it in an MMOG/RPG/Action/ETC Age of Conan" - Wikipedia - . Another editor contends The Realm was first. All the same, this is an important part of AO history and present gameplay.
Instances in Anarchy Online may be in the form of private instance, like Mission instances that require a key to enter, or Team Instances that also can only be entered by the team, or in the form of the public instances like Subway and Crypt of Home
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