Someone as been annoying me about getting it v4, so i did.
(btw, i hope that "that person" actual does what he promised to do)
Well theirs a few secrets on the map, some screenys show some of those places.To make these secrets work, u need to know the button combination which i wont tell no one about.
The fix for one of the secrets.
You've used a lot of models and textures, however the overall look of the map is pretty poor. You have not added in any lighting nor changed the sky from default, resulting in a very bland look thats even harsher on the eyes due to mat_fullbright being on.
Always always include lighting in your maps, its a requirement, you can't just forgo the proper lighting, you need to make the effort to add it into all your work, simply doing that vastly improves the look of the map.
While you seem to be able to use a variety of prop types, you should start to do the same with your brushwork, at the moment its all basic block shapes with a single texture applied to them. Try making some other shapes and cutting your brushes up to add in some trim and detail work to the textures being used.
Texture alignment is something else to pay attention to, most of yours are not aligned or fit properly on your brushes, play with scale, alignment and rotation to achieve better looking results in your next project.
Please use the tutorial section of this website as it contains several very good guides on basic mapping and principals that you should be following.