A MUSH, or Multi-User Shared Hallucination, is similar to a chat room. X number of people log into it at the same time, and you interact with them in a real-time basis. Most MUSHes have some set theme, and a number of rooms to explore and find people in. Below are two pages for the two primary groupings of MUSHes I play, and a third page for the characters who don't fit on either of those pages.