by Bill Bores
Port Authority of Allegheny County SD400 LRV puzzle, based on an original photo by Bill Bores (photo copyright Bill Bores -- used with permission). Photographed at Bethel Park, Pennsylvania, October 17, 2017.
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.