Hello everyone.
 
You no longer will see 'Alas, you cannot go that way, there is something 
strange there.' message when run into the hidden closed exit, instead
you will see a usual 'Alas, you cannot go that way.' message. 
But after some time as you enter the room you may notice that there 
is something hidden in some direction. How fast you detect it and how
often you do it depends on your Per stat and search skill.
 
-Omen