I am stuck on the section C second floor wall puzzle with 4 red double beams and 3 blue switchable beams. I've been trying to find a working solution for several days now.

I'm in D-Section and i had already to look up for solutions for 2 puzzles - maybe more to come!? In a game this diffucult, there should be some hint system, e.g. a 3 stage help, which places some "key"-cubes in a fixed position, so you can easier build the rest around it. If my life would be dependend on solving all the puzzles by myself i would create a program which brute forces the solutions. The emotional reward after solving asuch a puzzle is to small for me, that i would invest hours of (re)thinking...

Got all of the diamond keys but haven't been able to get red back for the 3 Xs

I've played all rethinks except RTE4&RT4, and enjoyed them all(gonna play the rest soon). Puzzles are great and I'm in love with the art style! If there will be a future rethink game, it'll be cool if there was nighttime, or even a day&night cycle. Since this game has lots of LED light decorations(as well as lots of lazers while you solve puzzles), I think nighttime in rethink will look very pretty :D...

After completing the game and saving in the area after world E, I tried to reload my save and it just sends me to an area outside of the map. I'm unsure how this happened