set explore_inform on:
Whenever you walk into a room that you haven't been
before, it says 'You've never been here before', or
something.

Pretty easy to do with trigger, since you get roomcount to your prompt.

--
Juo Ppo

I would love to see something like "You feel a bit puzzled about this place."
etc. in room desc if you're in an area where you still could find new rooms.
Perhaps add the line to /std/room.c with the equivalent "You feel familiar
with this place." when you have been in all rooms (and perhaps solved all
quests)

sc set YourOwnStuff Exp:<exp>({diffexp})<rooms>

#REGEX \"Exp and Level ripper\"
{\\s+Exp:([+-]?[0-9,]+)\\(([+-]?[0-9,]+)\\)(\\d+)\\s+} {#If (%3 !=
@Explore.Current & @Explore.Current != \"\") {#Variable (Explore.Current)
{%3};~@emote smiles as he explores a new place ~(Experience:%1 ~{%if(0 < %2,
%2, \"\")~} Explore:%3~)}} \"Character\" {prompt|case}


Tötöröö, there you go.

A hits you.