Los Angeles- and London-based casual gaming developer King.com said Thursday that it has launched a new Facebook game, Bubble Witch Saga. According to King.com, the newest title was launched in the run up to Halloween, and focuses on bursting bubbles around a witch's cauldron. King.com said it now has over 200 games running online, via Facebook, on mobile, and tablets. King.com is headed by Riccardo Zacconi.