BadTrip is an online mud, free to play and available to anyone.  If you are new to the concept of text based games you are in for a real treat.  BadTrip is a very friendly and active mud for you to start on.

To play you will need telnet access or a client application like zmud. To connect you need to use badtripmud.com 7778.

Note: For Mac users you do not need a mud client to enjoy Bad Trip, please see the post “Mac Mudding” in the Mud codes section of the forums.