Reason why somebody (in our case student) want to do something, especially if that involves hard work and efforts, and behaves in a particular way.

MUD (multi-user dungeon, dimension, or sometimes domain) is a multiplayer role-playing game running on internet servers or message boards. Players take the role of a character, and operate in text based worlds. Instead of using graphics, textual descriptions of rooms, characters, and non-player characters (NPCs) are used. Communication is reached by typing plain commands.
In traditional MUDs, the main characters are knights and wizards, the fantasy worlds are populated by mythical animals, attempting to slay monsters and complete quests. Some MUDs have science fiction.

mode of video or computer game in which multiple people can play the same game at the same time.
Usually multiplayer games use computer networking or require the players to gather around a single game system.