Not so hard but of course it's not an easy map! I solved it in 15-20 min, and I have really appreciated it because it's well balanced and really enjoyable! ;) Thx for your job mate!
If you want to try my map, here's the link! ;)
http://gtm.steamproxy.vip/sharedfiles/filedetails/?id=77292983

Now this, this is a mental workout! =)

Finally solved it. That last part was extremely difficult to figure out. Whew. This one and Tower of Babel are the two best that I've played so far.

Solved... One of the most difficult maps played yet. Getting to the lower level is one of the easiest parts of this one. If you can't even do that step away from the keyboard. Getting stuck under the EF grill is a level restart and a PITA, a portalable surface on the wall under the grill isn't going to change the rest of the map...