The Tier 13 Egg is an egg obtainable in Pet Simulator. It was introduced during Update 4.
This egg is worth 65,000 Moon Coins.
While it is the cheapest egg on the Moon, you will find either a Space Cat, Space Dog, Space Bunny, Alien, Wooga, Puffer, or a Space Dragon. Each pet has its own strengths and weaknesses.
Common: Space Bunny, Wooga, Space Dog
Uncommon: Alien, Puffer, Space Cat
Rare: Space Dragon