Considering Mission 2:

I don't completely understand it either but after you put the switches in the right order you get access to that room B2 (nice music thingy btw). In that room you'll find lots of yellow crates to jump on and a switch-jump-n-run task to do. Unfortunately you'll just run into another disfunctional elevator. For reasons I don't really know I now had access to that door in Laboratory A (it might have something to do with those gas containers you can pick up). There you find a computer screen which makes the laser barrier switch in Lab B work. Behind those lasers is a computer which activates all elevators. So you go back to that storage B2 where you get a key for section B. There you can get some hints of the walls and get another switch riddle which is not that easy to solve though. You have a hint but that somehow doesn't work. IIRC that's the point where you go to that elevator near the first switch riddle. There you get a key for the command center. In the command center there is a computer with lots of log entries. It contains a hidden hint which let's you solve that switch riddle in section B. I think that's where I am right now...

You'd expect this game to be extremely short and simple but it actually has some clever ideas and isn't all that short. Kudos Mr. Gorski...