ugh
it's on the tip of my tongue, I found just such a room, "10x10", and unreachable by normal means, some months ago right when we where having problems with piggy popping you places other than zone ins.
this room, I'm sorry I'm not an ole schooler like i wish I was, and I know I'm gonna get burned for not remembering or going out and finidng it, but, it's the zone with the giant dwarf named. PLANE OF MISCHIEF! That's it!
ya, a box with nothing but locations written on the walls, I'm still not sure what you mean 'kitty kat room', but ya, there's at least 2 or 3 of these boxes out there, and you can't run out of the ones I've found either, you have to warp out of gate out basically.