Shirushi (印)/guide

Bandage (ほうたい)
Enter the dark gray door. Navigate your way to the green statue. In the hallway you're taken to, go straight up and enter the doorway on your left. Interact with the bandaged circle.

Tiger (とら)
Enter the blue door. Go up a little bit and right. Go between the three small rocks and large stone pictured to the right. Interact with the can. Go right then go through the doorway. Go right and up and interact with the cat.

Chikuwa (ちくわ)
From where you get the icepick effect, go north-east and go between two icebergs. Go down and between two more icebergs. Go north-east and find a wall with a light blue tile on its bottom row.

Interacting with this tile will teleport you to another maze-like area. Find and interact with an icecube. Go down until you see several white sticks in the ground, then go left and interact with the nail. Interact with the chikuwa.

Ice Pick (あいすぴっく)
Enter the dark gray door. Navigate your way to the purple statue. From where you're teleported, keep going up until you reach the Ice World. Go north-west and interact with the pick in the ground.

Flute (フルート)
Enter the green door. Go south-east and between two trees. Enter the building north of you. Go left, down the hallway and enter the door. Interact with the NPC on the couch.