Your World of Text

Your World of Text is an infinite grid of text editable by any visitor. The changes made by other people appear on your screen as they happen. Everyone starts in the same place, but you can scroll through the world using your mouse.
Put any letters at the end of the URL to go to a new world. For example, http://yourworldoftext.com/forexample. They all start off blank. You can also create a custom world for you and your friends.

my page on YWoT

Colossal Cue Adventure: a Zork-style text-based programming adventure game (cueup.com)

    COLOSSAL
  ___ _   _  ___
 / __| | | |/ _ \
| (__| |_| |  __/
 \___|\__,_|\___|

     ADVENTURE
 
Colossal Cue Adventure is a Zork-style text-based programming adventure game.
 see the comments about this game here(HN).

The little maze of twisting passages that follows may take anywhere from twenty minutes to a couple hours to complete.
You will face three tests of programming courage, and at least twice as many bad jokes.