Thank you very much. I used the "shift" trick, worked great. Now I have another problem with same stairs. Not a big problem, but it bothers the hell out of me, so I won't proceed further with map, till I figure it out. In the stairwell, no matter where I put light entities, even right above them, stairs 6 and 3 from the bottom, are black on top. I want players to be able to see all the stairs. I assume it's a shadow or something, but damn it, it can't be. I've moved lights around in there all over, at least 10 times, and no matter where I put the ligths, those two stairs are always black on top. Even ones right after them are seen plain as day, makes no sense to me. Any thoughts?