This cute game learns from its mistakes. If the game is hosted on various sites, how would we collectively learn?
Animals builds a decision-tree that guesses an animal. When it fails to guess yours, it asks for a question that might divide the search space.
pages/animal-guessing-game
Think of an animal. This script will ask a few questions and then guess your animal. github 
http://ward.dojo.fed.wiki/assets/pages/animal-guessing-game/photos.html HEIGHT 500
Now with photos from wikimedia commons. github
I have to ask for the player's help when I guess wrong. Help asks two questions. See Not a Whale - What is your animal? - What could I ask to tell it from a frog?
I think it would be awesome if advice collected throughout the federation can be combined into one game by some kind of tree merge. matrix