Mongolian Railway M62UM puzzle, based on an original photo by J.Boeisen (photo copyright J.Boeisen -- used with permission). Photographed at Darkhan, Mongolia, May 15, 2016.
Click here for more information about this photograph
The "Easy" version of the puzzle has about 100 pieces, "Medium" has about 200 pieces, "Hard" is about 300 pieces. For the Online puzzles, see the Online Puzzle Tips.