Rare Egg can be bought for 10 Crystals from the Get Pets page. This kind of egg will hatch B or A grade Pets, or possibly 10,000 coins if you already have at least one B or A grade pet at Level 8. You will also receive 33 gift points for each purchase. You may receive an upgrade of a Pet you already own, if it's not at level 8 yet.
In the first two seasons, rare egg can be rewarded by inviting friends in the Invite Event as a replacement from the Extra Rare Egg. However, in the third season, it is replaced back by the Extra Rare Egg.
List of Pets obtainable or upgradeable from Rare Egg Edit
|Witty Dumbbell||Makes Giant Jellies|
|Mocha Delight||Makes Alphabet Jellies|
|Cozy Yarn||Bonus Time Jellies|
|Rare Garlic||Makes Blast Jellies|
|Electric Beat||Makes Magnet Jellies|
|Hat of Santa||Makes Silver Coins|
|Dust Unicorn||Makes Gold Coins|
|Flowercopter||Speeds up Bonus Time|
|Wishing Star||Revives the Cookie|
|Brain Gum||Slower Energy drain|
|Dragon's Tail||Call Dragon's Spirit|
|Lucky Dice||Makes Power Jellies|
|Brown Balloon |
|Saves Cookie, XP Bonus|
- To date, only Luck-o'-Lantern, Brown Balloon, and Cony Balloon are unobtainable through Rare Egg. The three mentioned are event exclusive.