https://www.polygon.com/2017/10/26/16553906/super-mario-odyssey-post-game-unlocks-ending

Most of the world is just starting to get its hands on Super Mario Odyssey, and as you dig in, you might be wondering why you’re having trouble getting every moon in a kingdom or just how deep the rabbit hole of this game goes. Lucky for you, we’ve been playing for a week straight now, so we can fill in some of the details.

Spoiler warning: While this post will not discuss any specific plot or gameplay sequences, it does spoil some of the rewards you get for “finishing” the game. If you want to be surprised, read no further.