To maximize your puzzling space, click on the Maximize button in the lower right corner of the puzzle screen for fullscreen mode. Click on it again to return to normal mode.

For more tips, see the Online Puzzle Tips page.

RhB - Rhätische Bahn ABe 4/4 puzzle, based on an original photo by Georg Trüb (photo copyright Georg Trüb -- used with permission). Photographed at Alp Grüm, Switzerland, October 18, 2019. Click here for more information about this photograph