|The Holiday Spirit has been freed! Clear skies ahead!|
Holiday Spirit is a special type of gene that is unlocked by completing the Dear Santa Mission. To complete the mission you need all Santa's Reindeer. You can obtain them by spotting Santa when he's flying over your city, or by playing the Reindeer Games in your own or in one of your friend's cities. The mission can also be bought out at the cost of €4,49 or $4.99.
The Holiday Spirit was introduced in the game with the 1.70 Update.