This is a logic puzzle game in which the player must correct a series of
programs to print the desired numbers on a Turing Machine tape. This game
appeared on the Google homepage on 23 June 2012 to celebrate Alan Turing's
100th birthday, and is archived permanently at:

https://www.google.com/doodles/alan-turings-100th-birthday

Please feel welcome to extend and enjoy!

License notes

We are sharing the code of the doodle under the Apache 2.0 License, but the
images and animations accompanying the doodle under the Creative Commons
BY-NC-SA 3.0 License. The big difference between those two is that the first
one allows commercial re-use, whereas the second one forbids it. This is mainly
to protect our Google logo; contributions of original, unbranded artwork would
be welcome.