A World of Thanks by Project Fi –– Interactive

Background: Project Fi is Google’s answer for a better way to deliver a simple wireless experience.
The ask:  Launch a digital holiday gift to drive engagement amongst existing users as well as bolster awareness and consideration for subscribers of tomorrow.

Users were invited to enter and explore new worlds each week, discovering easter eggs, tips and gifts all season.

The results were undeniable, receiving consistent engagement from over 50% of users.
Plus the client called it an "absolute homerun" so that's a win.