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.

CSX Transportation (CSXT) SD40-3 puzzle, based on an original photo by David Rohdenburg (photo copyright David Rohdenburg -- used with permission). Photographed at Covington, Kentucky, February 18, 2019. Click here for more information about this photograph