Szeged Transport Limited (SzKT Kft.) PESA Swing puzzle, based on an original photo by Sly77 (photo copyright Sly77 -- used with permission). Photographed at Szeged, Hungary, September 22, 2016.
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.