Alan Turing's 100th birthday has passed. But you can celebrate it forever.

This past week, Google open sourced the code for the animated Turing Machine logic puzzle it posted to its homepage in celebration of the computing pioneer's centenary. Turing would have been 100 on June 23rd, and one of his most famous creations was Turing Machine, which exhibited some of the fundamental concepts that underpin today's computers.

The logic puzzle was one of the "Google doodles" the company regularly posts to its homepage, replacing the usual Google logo. If you missed it, you can still give it a spin in the company's "doodle archives." But now that it has been open sourced on the company's own Google Code site, you also tinker with the underlying code.

"My hope is that people look at it, play with, and extend it," Jered Wierzbicki, one of the three Googlers that designed the Turing doodle, tells Wired, "and then make the game more elaborate and more interesting."

And if that's not enough Turing machine for you, three Dutch researchers can show you how to build your own LEGO Turing machine.

And if you get bored with Turing, there are other options. Google has also open sourced doodles celebrating sonic innovator Robert Moog and science fiction writer Stanisław Lem.

If you can build a Turing machine Moog synthesizer that can take you to Solaris, we'll be very impressed.