Treasure Shrine

Ooka's puzzle#1: " In the Treasure Shrine (Near Parcelyte), there is also a chest you didn't get. To find it: go through the central door near the entrance (the one you need the key to open). Go through the hall, up the stairs in the next room, down a couple of screens, and you'll be in a room with a moving platform and some switches. Move to the bottom-right platform, and through the next 2 doors. The room you are now in should have some stairs and a door. Walk to the upper right-hand corner, and walk to the right (into the wall. If you look closely, the bottom of the wall looks different from most walls.) You'll step on a switch and a new area will appear, with some enemies and the missing treasure chest." This will lead you to a Mind Ring.