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Super Mario RPG

How to Open the Door in Monstro Town

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This is a guide to opening the Sealed Door which houses the Secret Boss Culex in Monstro Town. Learn the step-by-step process to unlocking the door, what items you need, and at when you should open it.

List of Contents

How to Open the Sealed Door

Open with a Shiny Stone

Sealed Door Unlock Step-by-Step Guide
CheckmarkBuy Fireworks in Moleville
CheckmarkExchange Fireworks with a Shiny Stone
CheckmarkUnlock Sealed Door in Monstro Town

Buy Fireworks in Moleville

Super Mario RPG - Moleville Fireworks Vendor.png

The first step to unlocking the Sealed Door is by purchasing Fireworks in Moleville. These can be bought from a mole for 500 coins. Once bought, proceed to the next step.

How to Farm Coins

Exchange Fireworks with a Shiny Stone

Super Mario RPG - Moleville Fireworks Shop

The purchased Fireworks then must be exchanged with a girl mole next to the house where you bought the Fireworks.

Once you have acquired the Shiny Stone, proceed to Monstro Town, where it must be used to enter a sealed door leading to Culex.

Unlock Sealed Door in Monstro Town

Super Mario RPG Remake - Unlock Culex

In Monstro Town, proceed to the sealed door that will react to the Shiny Stone. When interacted with, the door will be opened.

Proceeding inside will lead to a dimension with Culex in view. The boss will ask you if you wish to take up a challenge of combat against it.

The Shiny Stone will not be lost after opening the Sealed Door, so you can choose to sell it again to the Mole in Moleville to get some Carbo Cookies.

How to Beat Culex Secret Boss

What is in the Sealed Door?

Leads to the Secret Boss Culex

Super Mario RPG - Versus Culex

The Sealed Door in Monstro Town houses Culex, a secret boss that is best fought at party level 20 or above.

Culex is a difficult boss, so be prepared! If you are not ready yet, you can choose to decline the challenge and return at any time. Consider looking for the best equipment and forming the best party before fighting him.

Defeating him will reward you the Quartz Charm, one of the best accessories in the game.

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