Having completed Steam version of Pilot Brothers 3: Back Side of the Earth, I think it's important to add to http://www.legendsworld.net/adventure/game/7850 to
"In May/2014, an English app version was released on Windows 8 store and later on Steam.", that the English remake is strpped down version of the original. It has only 14 levels. As I got stuck with illogical puzzles, i looked for help and found walkthrough video https://www.youtube.com/watch?v=DqOMsgHK16A of original Russian version. It has 9 more scenes (some are levels, some may be another room of the same level) in second half of the game.
Additionally the GUI is slightly different.