by Jacobo Ruiz
Metro Ligero Madrid Citadis puzzle, based on an original photo by Jacobo Ruiz (photo copyright Jacobo Ruiz -- used with permission). Photographed at Madrid, Spain, September 8, 2019.
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.