well this is a stupid problem i believed most begiiners at mapping have encountered but i would really appeciate if someone helped me. well basically it just the leak problem I JUST CANNOT REPAIR even thou have found it using pointfile. i hope somne one would have helped me when i login in two hours. THNAKS A LOT
Also, I would advise you to use thicker walls for the outside. It's easier to work with. Oh, maybe you don't know that you can snap brushes to the grid (Shft + W), but it's a handy setting to avoid thin leaks because you just left 1 unit between two walls.
The steep corridor behind the door should be closed of with a brush at the end, and you should look at the floor of that corridor and align it up with the walls correctly.