/main
/main is a world created and managed by the user fp. Its concept is similar to that of the main page, but with a stronger focus on spam/grief prevention, script-prevention, and original user created art. /main has a lower rate limit which makes pasting text slower. fp keeps backups of /main so in the case of a grief attack, fp can roll back /main back to its original state.
Besides some basic anti-grief/spam measures, /main is pretty lenient on other user capabilities such as allowing users to change their cell colors (which is disabled on the main page).
To many OWoTers, /main is seen as a safe haven from the main page, and /main is a favorite world to many users.
A popular trend on /main is creating and showcasing stylized user created center consoles. The center console takes up the first 4 center tiles of the world. An Archive of these center consoles can be found on /mch_complete and /main_console_history.
You may also find many stickmen, spam machines, classes, and mario/luigis on /main.