Something is off

Ok, since after 1 year I got promoted to "member" (yeah, I'm quite inactive in this forum, time is something what I don't have nowadays, unfortunately ), so I decided to create new puzzle with similar concept to "easiest puzzle". But this one is much more difficult and (unfortunately) not very great in terms of stability (it is consistent, but one mistake might take some time from your progress). If you have any questions or have troubles with completing this puzzle you can always ask me for a hint.

By the way, I wonder, if you found contradiction in this thumbnail. (Something, what should be impossible)

That was hard for me. I think it was the size and therefore the possible options to go with. Thanks

@gmacpro woah, thank you very much. I'm very surprised, that somebody managed to complete this without any hints. I guess skills and patience are going to be the key to complete this one. I hope it wasn't TOO long and obnoxious for you.

@nGord Thanks for your comment. Yeah, this thing with bots is very annoying. I wasn't even sure if this whole "illusion" was worth it, since I had to sacrifice stability. I hope it wasn't too bad in overall.