that one mission with they incorporated system shock with a underground temple was amazing, we need more thief universe mixing in fan missions

That reminds of an older mission where you had to solve the puzzle to get the loot by learning a bit of braille. I can't remember the name of the mission that was fun to figure out but I had to go to the Internet to find out that it was numbers written in braille.

There is also a complex puzzle in a mission by Yandros that I spent hours on, but was impossible for me to figure out because of the colors, and I'm colorblind. There was another way to figure out the puzzle, when I gave up and asked, that was well beyond my knowledge and logic level at that time. I'm a tiny bit smarter now.

Overly complex missions and puzzles are good because they stretch the mind and improve thinking but can sometimes kill the momentum and emersion. That reminds me, I have a stack of missions I need to get back to playing and try to get through the stuff that stopped me.

One of the biggest things that annoys me, but I'll still play a mission, is a non-linear mission where you find helpful clues and secret passageways well after you did things the hard way. Maybe that's my fault though for going too fast through a mission.