Guess the Wikipedia article from just the Table of Contents.
Credit to xer0a for the original idea.
These are the steps for contributing a puzzle through a pull request, which allows zbanks or others to add the puzzle without being spoiled.
You can also reach out to zbanks directly with a Wikipedia title, and he can add it to the list and give you credit.
Use wiki_game.py to append a new puzzle to puzzles.txt using a Wikipedia URL. You can optionally name yourself as a contributor for credit.
$ ./wiki_game.py add --contributor zbanks "https://en.wikipedia.org/wiki/Test"
Once you've added your puzzles, you can rebuild the webpage that contains all the puzzles, docs/index.html:
$ ./wiki_game.py generate
After doing this you can commit, push, and submit a pull request to merge your changes in.