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Players will encounter a ton of locked doors across the world ofDragon Quest 3 HD-2D remake, preventing progression and hiding rare items. Luckily, an item called the Ultimate Key allows the player to open any locked door in the game.
Finding the Ultimate Key isn’t easy and there are a handful of prerequisites the player must meet before it becomes available. It’s not only worth it because it allows you to find quality goodies, but it’s also mandatory to progress further in the story.

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Players will need to get into Edina and acquire the Bottomless Pot first before getting the Ultimate Key. Once you receive it, you won’t have to worry about a locked door blocking your path ever again.

How to Get Into Edina
The first thing to know about getting the Ultimate Key in Dragon Quest 3 HD-2D remake is thatit’s only possible to get once you start the main quest to find the six orbs and unlock the ship. If you have yet to reach this point in the main story, then continue progressing until you do.
Once your objective is tofind the six orbs, the first step in getting the Ultimate Key is totravel to Edina in the northwest section of the map.

After arriving in Edina, you’ll immediately get turned away by the guards at the entrance. Speak to the NPC near the gate (not the guard), who will inform you of a unique item called “Fading Jenny” and mention how it can help you sneak by the guards.
So, that’s exactly what you must do —find a Fading Jenny and sneak into Edina. Don’t worry; finding a Fading Jenny isn’t a difficult task, but be prepared tofight some monsters along the way.

How to Get Fading Jenny
Players can find a Fading Jenny at the item shop in Lanson, a town located on a small island south of the map. If you have yet to visit Lanson, you unfortunately can’t use the Zoom spell to teleport there. However, if you have visited before, then go right ahead anduse Zoom to teleport to Lanson.
If you haven’t been to Lanson, you’ll have tosail there by ship.The best way to reach Lanson is to start on the west side of the map near Edina and sail south, sticking close to the shoreline and then heading southeast when the shoreline ends.

Once you reach the small island, press the ship against it and select the land button. Now head into Lanson (the only location on the island) andpurchase a Fading Jenny from the item shop for 300 Gold.
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With the Fading Jenny in your inventory, it’s time to teleport back to Edina and attempt to get past the guard at the gate.
After returning to Edina, select the option to use Fading Jenny by going into your item bag.This will make you and your party invisible, allowing you to walk past the guard without getting noticed.
Once you’ve gained entry into Edina, head down into the cellar by taking the staircase on the left-hand side. It’s here where you will come face to face with a puzzle, where your objective is to get the three boulders into the blue squares.
How to Solve Edina Boulder Puzzle
The boulder puzzle can be tricky, and it took me a handful of tries until I finally got it right. If you mess up, just know that you’re able to reset the boulders by a quick press of a button. It’s important to note that there isno way to pullthe boulders —you can only push.
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Here is the correct solution to the boulder puzzle in the Dragon Quest 3 HD-2D remake:
The northern door will open after placing all three boulders in the blue squares. Head through this door andopen the chest to acquire the Bottomless Pot,a crucial item that’ll allow you to get the Ultimate Key.
Before leaving Edina, take some time to look around. It’s a fairly large place and you may even get lucky enough tofind some hidden Mini Medals.
How to Use The Bottomless Pot and Get the Ultimate Key
With the Bottomless Pot in your possession, the last step in getting the Ultimate Key in Dragon Quest 3 HD-2D Remake issailing north to the Shoals, a small bundle of rocks in the middle of the ocean.
The best way to reach this location is bystarting from Lanson and sailing northeast, going through the opening in the mountains that connect the two continents. This is a long trip, so I recommend making sure you are usingthe best vocationsto deal with the monsters of the sea.
Once you arrive at the Shoals, select the option touse the Bottomless Pot, causing the ocean to part ways and raising the Shallows Shrine out of the water.Next, enter the Shallows Shrine, where you will find a small chest containing the Ultimate Key.
With the Ultimate Key in your possession, the possibilities are endless. However, I recommend using it first on the locked jail door in Theddon so you can acquire the Green Orb.