Where's the Snow Dojo?

Here is a message from Polo Field:

Hey ninjas,

Alright! You know the Card-Jitsu Snow Beta Test is coming. You know Snow Ninjas will be teaming up with Fire Ninjas and Water Ninjas. And you know that together, you'll be going up against dangerous villains: Scrap, Tank, and Sly.

So now the question is: where's the battle going to be?

Tell us where YOU think the Snow Dojo will be and what it'll be like!
Waddle On!

I think the Entrance to the Snow Dojo will be located here :)

…and it’s hidden up there on that Mountain and it will be a cold place filled with SNOW :)

Secret Dojo Found!

Shadow Ninja Sneak Peek ANIMATED :)