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.

OBB Austria Rail 52 puzzle, based on an original photo by Antonio Martinetti (photo copyright Antonio Martinetti -- used with permission). Photographed at Ernstbrunn, Austria, October 4, 2021. Click here for more information about this photograph