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 earlier this month. The advent calendar will feature many exclusive treats over the next six days and door number nineteen on the calendar is now available to open due to the fact that today is the nineteenth of December. Behind today's door, there's instructions about how to play a new Doctor Who game which involves all ten incarnations of The Doctor and is titled 'Partners in Time'. You can find out how to play this game here and content from behind the calendar's previous doors can be found here. This year's twentieth door on the calendar will be available to open tomorrow and details regarding the next advent treat will be posted on this site soon. What do you think of this game?