my bad

I did talk about that one in the first post (On the B site building there's two)

also there is an invisible wall at the bottom on the b side that allows you to stand on the floor

More secrets

1. Underneath A site, there is a text that says "Hej Prille"

2. In the building in front of the T spawn, there is a text saying "Hej Kelvin"

3. The "Hej Plyster" secret mentioned in my other comment

thank you so much pr0k3y, you are missing 3 secrets though and there are ways to enter all of them (including the "Hej Plyster" secret) :)

Secrets:

1. Inside the building behind T spawn, there is a text that writes "Hej Plyster"

2. Next to a corner of the building where A site is located, a button can be pressed which will destroy all the floors and cover on the map (except on B site for some odd reason)

3. There are some walls which have their collision turned off, namely:
next to the button on A site,
On the right side of the building closest to A site (alongsite an invisible ladder inside),
On the B site building there's two,
And on the building with the "Hej Plyster" secret.

Very cool map, similar to a map of mine with a very similar idea