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How to Open Locked Treasure Chest in One Piece Odyssey | Key Guide

Find the Treasure Chest Key to open all locked treasure chests in the game.

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How to Open Locked Treasure Chest in One Piece Odyssey Key Guide

In One Piece Odyssey, it doesn’t matter how many pots you break or how many golden shines you look for and chase; you won’t find any lost keys to open the locked treasure chests.

Nami always tells you not to forget about them, so you can go back to them once you figure out how to open them.

However, you probably won’t find it because there’s only one key, and completing the Grand Line Quiz Side Story is the only way to get it.

Fortunately, this quest is very easy. All you have to do is answer questions about the manga and anime to show how much you know about One Piece.

The only problem is that you have to finish this Side Story’s stages in Arabasta, Water Seven, Marineford, and Dressrosa, respectively. Let’s get started.

Arabasta – Kid Level

Arabasta Kid Level

Source: Ben-Gun

The Grand Line Quiz Kid is in the northern Oasis campsite in the Great Sandy Desert.

To start, look for a girl with pink hair sitting in front of a brown tent when you get close. Talk to her and really listen to what she says. She’ll ask you to answer a trivia question after you talk to her.

If you say yes, the Grand Line Quiz Kid Level 1 Side Story or Side Quest, which has three questions, will begin.

Level 1:

  • Question: What animal will ask to become your apprentice when beaten in battle?

Answer: The Kung Fu Dugong

  • Question: What’s the name of a poisonous spider that looks like a fruit?

Answer: The Desert Strawberry

  • Question: Who are Alabasta’s ruler and twelfth successor of the Nefertari Royal Family?

Answer: Cobra

Level 2:

  • Question: What animal plays dead to steal the belongings of travelers?

Answer: The Bilker Heron

  • Question: What is the name of the large casino in Rainbase?

Answer: Rain Dinners

  • Question: What’s the name of the giant gators who inhabit Sandy Island?

Answer: Banana Gators

Level 3:

  • Question:  What is the rare, giant catfish found only in the Sandora River?

Answer: The Sandora Catfish

  • Question: What is port city Nanohana’s local specialty?

Answer: Perfume

  • Question: What is Alabasta Vice-Commander Pell’s alias?

Answer: Pell the Falcon

Water 7 – Lady Level

Water 7 Lady Level

Source: Ben-Gun

In the northeast corner of the Water 7 City Area, near the Mayoral Residence Plaza Yoisa Fast Travel sign, you can find the Grand Line Quiz Lady.

Talk to her once you get to the marked spot above and accept her trivia challenge.

Once you accept her challenge, talk to her again to start the Grand Line Quiz Lady Side Story which requires you to answer three questions (in no particular order):

Level 1

  • Question: What is the name of the Sea Train currently servicing Water Seven?

Answer: Puffing Tom

  • Question: What is the name of the annual high tide that overwhelms Water Seven?

Answer: Aqua Laguna

  • Question: What is the mounted transportation essential to living in Water Seven?

Answer: Bull

Level 2:

  • Question: What is the name of the endangered tree that is the strongest in the world?

Answer: Treasure Tree Adam

  • Question: How many foremen does the Galley-La Company have for each dock?

Answer: 5 Foreman

  • Question: What is the highest-tier Bull you can rent from the Rental Bull Shop?

Answer: King Bull

​​Talk to Researcher Zoner again to start the third level of the Grand Line Quiz Lady, which is slightly different from the first two.

Instead of answering her questions, you have to use her hints to figure out where she has gone, “I’ll be where the most important Galley-La Company employees hang out.”

The hint is about a place you’ve been before, the Dock One area, where you helped Granny Hatsu find Yuka and Nina at the beginning of the chapter.

You can get there faster by using Yoisa Travel or going through the big metal gate in the southeast corner of the Water Seven City Area.

When you get there, go to the area’s top left corner. Behind a wooden wagon is where you can find Quiz Researcher Zoner.

Talk to her to finish Level 3 of the Grand Line Quiz Lady.

Marineford – Madam Level

Marineford Madam Level

Source: Ben-Gun

For the Marineford Grand Line Quiz, go to the South Town area, which is in the middle of the map. The Zoner is an NPC with a big body and an orange shirt. You can find her in the square.

Level 1:

  • Question: What is the name of the prison impossible to break into or out of?

Answer: Impel Down

  • Question: What is the name of the bell in west Marineford?

Answer: The Ox Bell

  • Question: The Ultimate Military Force of Marines HQ are Aokiji, Kizaru, and who else?

Answer: Akainu

Level 2:

  • Question: What is the name of the giant gate in both Enies Lobby and Impel Down?

Answer: Justice

  • Question: The Three Great Powers of the Grand Line are the Four Emperors, Marines HQ, and?

Answer: Seven Warlords of the Sea

  • Question: What is the name of the warden of Impel Down?

Answer: Magellan

For the third level, the Zoner will run away again and give you another hint: about the bell in the Ox Bell Plaza.

Go to the bottom of the map and save her from a group of bad guys.

Dressrosa – Mister Level

Dressrosa Mister Level

Source: Ben-Gun

This time, the Zoner will show up as an old man north of the Yoisa Shop, in the upper left corner of the Dressrosa City area.

Level 1:

  • Question: What is the name of the place in Dressrosa where gladiators fight

Answer: The Corrida Colosseum

  • Question: What flower blooms in the gardens near the Dressrosa Royal Palace?

Answer: Sunflower

  • Question: What is the name of the violent fish that lives in the sea near Dressrosa?”

Answer: The fighting fish

Level 2:

  • Question: What are the dwarves who live in Dressrosa called?

Answer: The Tontattas

  • Question: Who is the man called the strongest gladiator of the Corrida Colosseum?

Answer: Kyros

  • Question: The current Ultimate Military Force of Marines HQ are Kizaru, Ryokugyu, and?

Answer: Fujitora

For the final level, you need to put together a set of clues that will lead you to the alcove south of the Colosseum.

The Quiz Researcher Zoners are actually a family, and you have to save the youngest one from a group of bad guys. Defeat them to get the Treasure Chest Key.

And you’re done! We hope this guide helped you finish the Grand Line Quiz Side Story and get the Treasure Chest Key.

Now, go do it on your own and open all Locked Treasure Chests.

ALSO READ: Where to Find Bubble Bubble Mushrooms in One Piece Odyssey

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