There are several secret rooms in the game. They may be found by hitting various walls and obstacles in the correct location to open passages that lead to chambers filled with power-ups.

Level 1
Hit the wall just right of the Hara Temple entrance to reveal a $100 head.

Level 2
Hit one of the pier columns on the far side of the bridge to reveal another power-up.

Level 3
Hit the right side of the Amusement Park entrance at the beginning of the level for a $100 lollipop. Hit the right side of the bridge at the end of the level for a power-up.

Warlock Zone 1
Hit the stone marker located directly below the big bell to reveal a hole. Jump into the hole to reach a room filled with rocks and special items. At least three pairs of Straw Sandals are needed to jump over the rocks to reach the items.

Warlock Zone 2
Find the locked door just to the east of the sauna. Break it open with a weapon and enter to find another hidden treasure room.

Warlock Zone 4
Hit one of the walls on the side of a house in the village.

Warlock Zone 6
Hitting a location on the wall in the village between two stacks of boxes.