Treasure Rooms
At the very end of the pyramid is an invisible hole that leads you to the boss. Jump over this hole and walk through the left wall to reach a treasure room.
If you climb all the way over the pyramid you'll find a sphinx. If you have the Thunder Saber or Legendary Sword you can break the walls of this room and fall through. There are several chests down below, but you can only open one at a time—pushing 
on any of the others will take you back outside.
In the mouse block maze just before the forest make your way to the top-left corner and jump offscreen. You'll arrive in a treasure room with healing hearts and lots of money.
On the way to the Samurai In the caves leading to the Samurai castle you'll pass over this hole. If you push up at the right place you'll find a door leading into it, then find the next hidden door to reach this area's treasure room.
Secret Shops
In the town, enter the bottom door of the tower and fall down. Jump while pushing and you will arrive at a shop selling Magic.
Just before the second lava pit on the way to the Samurai castle is a strange overhanging section. Push under here to find a hospital.
On the way to the Samurai castle the path splits in two, with the upper route seemingly a dead-end. In fact this upper area contains a secret shop that sells the powerful Tasmanian Sword.
Up in the sky above the town is a secret shop only Hawk-Man can access. It sells Thunder magic (1000 gold) and Charmstones (100 gold).
As Hawk-Man, fly over to the ruins of Meka's castle and push inside the pipe you escaped from at the beginning of the game. Here you can buy the Legendary Shield.
Max Charmstone Doors
Once you have 99 Charmstones several secret doors will appear around the village. These lead you straight to the various dragons.
-
Mummy Dragon
-
Undead Dragon
-
Captain Dragon
-
Daimyo Dragon
-
Vampire Dragon
