@Nobody No-One I think the missing models should be fixed now. Thanks for bringing it to my attention, I'll have to update a couple other maps as well. I also tried the button jump. It does indeed not change anything substantial apart from sparing a cube and I actually kind of like it.

@Nobody No-One thanks for playing and leaving a comment, I always appreciate getting some feedback. I think I am ok with that minor exploit, after all you can solve it any way you like and I don't mind if someone gets a bit creative with it. Unless it completely bypasses most of the puzzle, but that probably means I didn't do a good job with the design.

I'll look into the error models, There is supposed to be a crow sitting on the railing and I believe it is from the game so probably should work. The other one, well,.. there is a quite a lot going on in that obs room so I am not sure which is causing the error and as you mentioned it might be something on your end. It's one of those things that is tricky to test myself unless I had a completely clean portal version on another PC to test with. Actually now that I think about it, a friend of mine did try this map and didn't mention anything odd.

Update, I think the ERROR models might have been on my end since I've been getting some more in other maps. Mysterious...

Fun little map! I had some ERROR models (one in the broken observation room, one sitting on one of the railings in the funnel area). Very minor exploit: there's signage that indicates a cube climb to get up to the portal surface into which the CC falls, but you can also jump onto the respawn button and jump from there onto the surface. I'm not sure it causes any substantive problems other than skipping some minor tedium. Thumbs up!

@PhilFromFrance thanks for playing and taking the time to leave a comment, much appreciated!

Clever challenge.