Why? Because the dice in this set are marked with different villains from the series, which absolutely begs for house rules to be introduced. Get all your points exterminated if you roll a Yahtzee of Daleks, or an automatic loss for the next person to blink after a Yahtzee of Weeping Angels. The possibilities are endless.
The Doctor Who Yahtzee 50th Anniversary Collector’s Edition game is available from Entertainment Earth for about $25. Just make sure no one tries to fiddle with time by going back and changing a score while no one is looking.