Directly to you from Twitter:
The #FEHeroes New Year Event is here!— Nintendo of America (@NintendoAmerica) January 1, 2018
① Log-in Bonus: Log-in up to 10 times for a max total of 20 Orbs
② Special Maps: Earn Orbs the first time you clear them
③ Quests: Earn Orbs and Stamina Potions pic.twitter.com/GMOf40kmY5
…Wanna play? Buy a 3DS.
That being said, click on Fire Emblem Heroes for everything you need to know about the game. 😀