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.

SBB Historic De 4/4 puzzle, based on an original photo by Kaufi (photo copyright Kaufi -- used with permission). Photographed at Saland, Switzerland, October 14, 2018. Click here for more information about this photograph