Contributing is very simple, all you need is an account with github. Many economics already have one, if not it this is done less than a minute (and of course for free). Once you logged in, select the file you want to edit (for example the list itself), and click the small edit button (the pen). Once you are done adding or editing, just click the green 'propose file change' button at the bottom.
For the list itself, please keep it short and precise. Each puzzle entry should follow the following structure:
- The Name-of-puzzle Puzzle: Short explanation of puzzle. (citation where puzzle is first mentioned as 'authors', 'year', 'journal')
Within each category, puzzles are in reversed chronological order.
Once you are done, be very welcome to add yourself to the list of contributors!