At the end of each topic page there is a printer designed puzzle (desktop view). The most popular puzzles are here again.
The puzzles are provided in the form of pictures. A PDF reader is not necessary.
The more popular a puzzle is, the more often it is created. The creation varies between a few hours and a few days. Creation date and time are indicated at the bottom right in the image files.
The solution is intentionally omitted.
Since downloading and printing depends on browser, operating system and printer, no general instructions can be given here. If you do not know what to do, ask for the next nerd. Nerds - these are usually nice people, who are familiar with technology and usually like to help if you ask them nicely ;-)