The Ninja Hideout is an exclusive room which currently lies behind a chunk of snow. Access to it is not currently available. This room will only be able to be entered by Ninjas. To become a Ninja, you must progress your way through the belts and ranks, by winning Card-Jitsu battles. Once you have achieved your black belt, you can challenge Sensei. If you beat him, then you will be given a Ninja Mask and access to the Hideout. There will be a Martial arts Catalog available once you have reached there. Here, you will be able to buy The Amulet, which gives you access to the Fire and Water Dojo.