If you want to play MUDs then download
GMud or
zMUD to use as a client.
You don't want to play with standard telnet, that would really detract from the experience. I definitely couldn't play that like anymore. Most MUDs are designed to be used with a client that has improved functionality.
Also, in my long experience with MUDs, I've come to the conclusion that
Harshlands MUD is unmatched.
Everything is incredibly deep and sophisticated, from the world to the skill system to the crafting system to the character creation process to the number of things possible to do to the actual gameplay itself. You can be anything you want and do anything you want, from engaging in battles to being a chandler, from being a town guard to being in underground crime.
It's a low-fantasy medieval setting that is super realistic. You can only have one character at a time, and when your character dies, it is permanent. You must remain in-character at all times (there is an OOC command if you want to exchange MSN names or something to speak with someone outside the game), although the extensive character creation process allows you to determine what is in-character beforehand. It might sound like an RP or something, but all actions are handled by the game itself, so there needs be no willingness on the part of another person to engage them in any way.
As an example, one of my characters was caught poaching animals in the forest on the King's land. I was literally dragged to the prison by force (almost escaped custody on the way, but to no avail), and thrown into a jail cell. Another player was there as well, and after a moderate bit of discussion we realized that we were both going to be publicly executed. We decided to plot our escape, and exchanged messenger addresses to better coordinate our efforts outside the game.
Our plan ended up being that I would hide in the straw bedding, equipping a wooden pole I fashioned from breaking a broom in half. When the guard entered to bring us our meals, he was curious as to where I was, and the other prisoner said he didn't know. When the guard started searching through the straw for me, the other prisoner tackled him from behind and got him into a hold, then I jumped out and started beating the shit out of him. I removed his helmet first to make the blows worse, then removed his sword and equipped that. Right as I was about to finish him off, he managed to break free of the hold and limped for the door. All I had to do was strike him again, or simply close the door before he got to it, or even just block the doorway, and we had him. Instead, I was so surprised by his attempted escape that it caught me off-guard, and the next thing I knew he was locking the door from the other side.
Then me and the other prisoner decided we wouldn't go out without a fight, and he equipped the wooden pole and I equipped the sword and helmet. Then we stood ready, waiting, knowing our deaths were soon upon us. When the door finally did unlock, three men came in, all fully geared with armor and weaponry. They quickly butchered us to the point where we were incapacitated, said a few words about how we were scum as we lay bleeding to death on the floor, and then I watched as they cut off his head right then and there. That was the last thing I saw before my sudden death, which I assume was performed the same way.
The best part was, on a later character I ended up being a thief, and I was caught picking the lock on the church donation box. I managed to hide my lockpick inside my glove before they grabbed me though. After a bit of detainment at the jail, they decided to let me go, and gave me back all my belongings (except my coins, those greedy fucks). I did however get my lockpick back since they never checked my gloves for items
Anyways, the cell I was held in happened to be the same one I was in with my previous character, and my severed head was still on the floor.
The server info for Hardhlands is
NAME: Harshlands
HOST: mud.harshlands.net
PORT: 5555 (or 23 and 8080)