I wrote a flask app which implements the game of HIPE, described in Peter Winkler's book Mathematical Puzzles (which is comfortably the best book of mathematical puzzles I've ever read, if you're interested in relatively serious mathematics.
It doesn't have a lot of features yet, but you can play if if you click the button below.
It doesn't have a lot of features yet, but you can play if if you click the button below.