Groups comparison

Massively Multiplayer Online Game (MMO;MMOG;Persistent Online Game) - 1986 to 2024
Multiplayer games that are capable of supporting hundreds or thousands players simultaneously.

MUD (Multi-User Dungeon;Multi-User Domain;MU*) - 1987 to 2016
Text-based role-playing, simulation and/or action games that can usually be played with any telnet compatible client.

Pay-once MMO[Buy to play] - 2005 to 2019
MMOs for which you only pay once after which it's playable like any other game with no need to pay subscription if one even exists. Pay-once bit does not extend to expansions or possible microtransactions.

mmog
mud
payoncemmo
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