The Great Snow Race was a party that took place from August 25 to August 31, 2011. It was first confirmed in a parent email newsletter along with the information about the new System Defender level. Construction began on August 18. The Toughest Mountain from the Mountain Expedition returned for the party, except everyone could access it. Operation: Hibernation took place during this party. Players could earn the AC 3000 Pin for defeating Herbert. Three new party-exclusive stamps were also introduced for the Great Snow Race: the Snowboarder stamp, the Mountaineer stamp, and the Stunt Penguin stamp.