In preparation for Christmas and the premiere of this year's remaining Doctor Who specials, the BBC's official Doctor Who website launched their online advent calendar for 2009 last Tuesday. The advent calendar will feature many exclusive treats over the next sixteen days and door number nine on the calendar is now available to open due to the fact that today is the ninth of December. Behind today's door, there's a new Doctor Who Christmas quiz which consists of twenty five questions in total and you can test your Doctor Who knowledge by taking this quiz here. Content from behind the calendar's previous eight doors can be found here, here, here, here, here, here, here and here. This year's tenth door on the calendar will be available to open tomorrow afternoon and details about the next advent treat will be posted here on this site soon. What do you think of this new quiz?