Level 11. Sumo Sky Palace (2)

Locate the gold key door. Open the panel on its left side to find the first secret.

Between the two slicing things (moving blades), there is a red chair. Interact with the chair; it will sink into the floor. Proceed through the newly opened passage and activate the switch on the other side. This will reveal another slicing thing. Collect the ammo here for the second secret.

This secret is located opposite Secret #2, on the other side of the slicing thing. Examine the panels in this area. Be cautious when jumping. A Guardian Head enemy will appear.

In the section with columns that move up and down, jump onto the outer perimeter wall. Traverse around to the other side of the large rock to uncover a plethora of various pick-ups for the fourth secret.

Near the top of a ladder, you will encounter an enemy that shoots fireballs. Navigate to the southwest side of this area and destroy the cracked wall to find some ammo, which is the fifth secret.