Buy Orb Packs: the cheapest package costs $1.99 and gives you 3 Orbs. However, if you buy the $12.99 packs, you get 23 Orbs, which means that you get 3 Orbs for free.

Connect to Nintendo account: You will receive 10 Free Orbs after linking it.

Play the story missions for will reward you with Orbs. So going through all the story missions is a must if you want to pile up some Orbs for free!

Login every day, you will receive free Orbs.