Doctor Who fans, get ready to lose all remaining productivity. The latest Google Doodle just went live on Google New Zealand, and is about to roll out around the world.

It's an 8-bit platform game in which you play the Doctor through all his 11 incarnations.

Celebrating the 50th anniversary of the Timelord, this epic multi-level Doodle has been in the works for four months. At the Googleplex in Mountain View, it became known as the "Whodle." The company says it's the largest interactive Doodle yet created.

Your goal as the Doctor is to retrieve all of the letters in "Google" and return them to your TARDIS, while avoiding the exterminating Dalek. Fall afoul of the evil Dalek and you regenerate into the next Doctor down the line. (John Hurt's "War Doctor", revealed after the Doodle's production began, is not included.)

Earlier in the year, a Change.org petition demanding a Doodle to celebrate the Doctor's 50th anniversary gained more than 4,300 petitions. Google won't say whether that petition inspired its Doodle makers, but they managed to publish it with one day to spare.

The game was designed by Matt Cruickshank, a British Who fan who moved to the Googleplex last year. Cruickshank managed to get the BBC interested in the idea, so the Doodle uses authentic sound effects from the show — including the TARDIS' famous "whoosh."

Cruickshank told The Guardian that he insisted something as long-running as Doctor Who had to be celebrated on multiple levels — literally.

"I really wanted to get the feeling across that you could travel to different eras," he said. "I definitely didn't want you to just play one level and that is it. I love the idea of the Doctor being able zoom around the universe."

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