This game was created Doug McInnes. His code can be found here, and you can play his version of the game online at his website here.
Caroline Buckey and Sarah Spikes modified the repository to create exercises for the Udacity course Version Control Using Git and Github. These modifications included introducing bugs and other changes into Doug’s commits he did not in fact create! The bugs are intended to give learners experience using Git to find the commit where a bug was introduced. To play the modified version of the game, simply open the index.html file in your web browser.
Many thanks to Doug for creating this awesome game.