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.

Citicorp Railmark Incorporated (CREX) ES44C4 puzzle, based on an original photo by Drew Mitchem (photo copyright Drew Mitchem -- used with permission). Photographed at Grants, New Mexico, November 26, 2013. Click here for more information about this photograph