Let's start watching the map. As you can see my map indicates that I have the castle 100% explored.

There are 20 hidden chests, some in normal rooms of the castle and others in the secret areas.




NOTE: At the room below the entrance to Gorgon Realm (West Addon, H9) there is a barrel behind a door. In the MSX2 version that barrel was a chest. I don't know if it's necessary for the achievement but get it anyway just in case.

In addition to instructions for each room, here is a video so you can see it clearly.


K3. You need the Soul power from the green mucus (Nyxa) at the sewers. With that you can go trough the floor.
K7. Hit the wall.
K18. Jump five times on that platform and the stairs will appear.
O18. Kill the bats. This secret room was at the demo.
G23. Hit the wall.
K23. You need to get through a fake wall at I22 to get to this room.
O23. Drop down from the right side of N22. In N23 don't kill anything. Just wait by the barrel and jump to the right over the crab. The passage will open. You will need some upgrades to get the chest though.
Y11. Hit the wall.
Y15. Kill the enemies and wait near the wall.
Z18. You have to wait here too. There is no need to kill all enemies here but it helps.
X18. Drop down from the right side of V18 so you can land on a small platform. In the room where the skeletons are, hit a wall at the top right.

I11 & M10. When you enter these areas the "secret area" message does not appear but you still need to enter there to get the chests. The Soul power we used for K3 is needed (the green mocus, Nyxa).

Every Dungeon has a secret. It is like a gravestone but it acts like a chest (money, arrows and mana). Most of them require to hit a wall while others require specific actions.


Dungeon 1 - Cyclops


Dungeon 2 - Arachne
Use the fireball to destroy that wall.

Dungeon 3 - Moax
Destroy 25-30 rocks in a row and the secret will appear where the arrows are in the image.

Dungeon 4 - Nephele


Dungeon 5 - Skorpios
For this one you need the Soul power of Nyxa, the green mucus from the sewers. Drop below the bridge at the beginning of the dungeon and you will fall into an area of lava. The chest/rune is on the right.

Dungeon 6 - Python
This one is tricky. You have to use Selene's wand to break that wall but without killing the earth-eating bugs because you need them to open your way to the secret. Or you can also destroy it and use the fairy to collect the items.

Dungeon 7 - Drakos
Kill several enemies in a row and items will appear. I counted 20 enemies.
Thanks to Tsuki Zero for this one. 😉

Dungeon 8 - Gorgon
The secret is to the right of the ice cubes, a breakable wall. I broke it with with Pampas' sword.

Dungeon 9 - Kraken
That is a fake wall. Go in with Selene and use your wand to destroy a piece of wall.

Dungeon 10 - Pyros
Hit these 'eyes' with Selene's wand and let Zeus do their part. The items will appear at the water.
Thanks to Kaltor for having such good EYE. 🧐


And with that the achievement is completed!