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.

Russian Railways ChME2 puzzle, based on an original photo by Ilya Semyonoff (photo copyright Ilya Semyonoff -- used with permission). Photographed at Balashikha, Moscow Region, Russia, December 30, 2018. Click here for more information about this photograph