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: http://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.