Entering Mushroom Island
On Mushroom Island in the wide ocean you first discover a frozen mushroom house. To the right is a toad masquerading as an origami fish.
Then hit the tree on the left so that a circle of fire appears. With this ability, you can melt the ice in front of the house.
Then enter the mushroom house and use the previously found mushroom knob to open the back door.
Luigi and the diamond key
In the backyard you will finally meet Luigi, who relaxes on a couch. Talk to him and you will get the important diamond key needed to access the diamond island.
Under the roof you will also discover a staircase leading to a secret origami workshop. Here you will learn more about the past of Olivia and Olly. Also free the origami master who was imprisoned by Olly.
With the diamond key you can now leave for the next stop of your journey.
Continue on the Karo Island.Diamond Island
Toads
Treasures