plinkie: Ok, i have fixed the problem now. The player can goes to the second floor and back to first floor. But when the player goes back to the first floor, then i can't see my "debug console" - it's hidden or what is wrong?
P.s.: Oh, before I forget, can you could test times whether it is okay for you to control? I've tested with some of my friends and they told me that the doors are a problem.
THANK YOU FOR YOUR HELP! :)