Frozen World is a world which can be entered by making a portal similiar to the nether portal, but using glass. Placing water in the portal flame will make it activated and turn the glass into ice.

Mobs available
Mob name Rarity Type Snow Golem Common Passive
Frozen Golem Rare (only appear at the FrozenTower) Neutral
Frozen Zombie Rare Hostile
Yeti Extremely Rare Hostile
Penguin Uncommon Hostile

There's a night and day cycle so you can place a bed and use it.

Stub The article Frozen world is a stub. Expand it, or this Creeper will make your house a lot smaller...