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.

Norfolk Southern AC44C6M puzzle, based on an original photo by Michael Harding (photo copyright Michael Harding -- used with permission). Photographed at Millbury, Ohio, March 21, 2017. Click here for more information about this photograph