Winter Wonderland is the 12th biome. It includes 3 areas and 4 new eggs at the spawn. It features a rather interesting thing at the spawn when you enter this biome, which is Santa's Sled. Santa's Sled has nearly a trillion health, making it the hardest to break as of Update 14. The entrance used to be on a building in spawn, but now it's on the moon.
You can get to the Winter Wonderland by heading to the portal on the moon.
Small Coin: 300,000 Health
Medium Coin: 1,050,000 Health
Small Chest: 15,000,000 health
Chest: 50,000,000 health
Santa's Sleigh: 1,000,000,000,000 Health