Castle Takeshi: Secrets

To open the 3 rooms to the right of the last building, you will need to find and activate 3 switches hidden through the dungeon. You will need some ropes/grappling hook to reach one of them and a Sphere tech for the last one.

First Door

To open the first door, take the underground path near the beginning of the dungeon. There you will reach a house guarded by a few Hylotls. In the basement of the house, you will find a pool of healing water. You will find a proximity detector at the far left of this pool. Activating it by walking near it will open the first locked room.

Second Door

The second door is also opened by a proximity detector. From the house where you find the first detector, head to the right until you exit the underground part. You will then reach a small shrine where 4 Yokats attack you. The proximity detector is above that shrine. Climb on top of the shrine and look above you: you should see a wooden structure where a bell hand. The proximity detector is located on the right of this structure. You will need ropes or a grappling hook to reach it.

Third Door

The final switch is located near the end of the dungeon. Head toward the last building of the dungeon and reach the kitchen (last room to the right of the ground floor). Head downstairs and you will find a well. Dive into the water and you will find a small opening in the wall to your left. Use your Sphere to reach a small cave with a chest. The chest doesn't contain anything: it's actually the switch opening the last door. Unfortunately, it will also release 4 Gosmets in the cave.

Once you opened all the doors, exit the kitchen to the right and you will reach the 3 doors and the loot they were guarding.