Pull Request now includes Tetris!

completed: warmups
tower of Hanoi (with saving via YAML)
Mastermind(no saving, but yes AI)

Single block Tetris, with high scores saved, plus a difficulty setting as well. (Boring under about level 8).
All in all Mastermind works great and actually looks way better rendered than my game does.  Good job all around.  I made a few small comments above, but a general comment on the game organization would be to split classes out into their own files and take care to only give other classes as much information as they need (i.e. the Mastermind class shouldn't really need to know what to tell a user before they make a move, etc)