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.

Re 421 puzzle, based on an original photo by Georg Trüb (photo copyright Georg Trüb -- used with permission). Photographed at Winterthur, Switzerland, September 20, 2022. Click here for more information about this photograph