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Fix leaks or add light.. it smels like fullbright. I hate it
First of all I think you should rename your map, dr_impossible already exists and it has existed for years.
And one big issue you should fix is the stairs being too high, you can't pass the map with standard CS settings at the moment. The map does look like it's ment more for autobhop servers or drshop servers, but you should still fix that. I would recommend changing some of the textures too, it's really annoying when the top of the block and the sides are the same color, you can't really see the edges of the block then.
As it is now, the map is far from perfect.