Location: Marineford
Petitioner: Quiz Researcher Zoner
Reward: Varies; see below
Objective Reward: Varies; see below

In order to play through this Side Story you need to accomplish two tasks:
  • First, you need to complete the Side Stories Grand Line Quiz Kid and Grand Line Quiz Lady. The first is found in Alabasta, the second in Water Seven.
  • Second, you need to complete the main story events of Marineford, during Chapter 6. Once this is done you can return to Marineford via Memoria and explore the town that was glossed over by the battles. 
The petitioner is in Marineford's South Town, in a plaza with a fountain. You'll need to have Franky build a bridge to reach South Town, though if you check the crates, barrels, and pots of the town you'll find everything you need. Once you're there you probably won't recognize Zoner, though she's very familiar with the Straw Hats by now. She has more quizzes for you.

Level 1
  • What is the name of the bell in western Marineford? The Ox Bell
  • The "Ultimate Military Force" of Marines HQ are Aokiji, Kizaru, and who else? Akainu
  • What is the name of the prison impossible to break into or out of? Impel Down
Reward: Shogun Jishi's Steak, 53,000 Berries
Objective Reward: 60,000 Berries

Level 2
  • What is the name of the warden of Impel Down? Magellan
  • The Three Great Powers of the Grand Line are the Four Emperors, Marines HQ, and? The Seven Warlords of the Sea
  • What is the name of the giant gate in both Enies Lobby and Impel Down? The Gates of Justice
Reward: Shay-King Parfait, 84,000 Berries
Objective Reward: 60,000 Berries

Level 3

Zoner's final challenge is hide-and-seek. She'll head to a plaza 'where a sacred key to a battleship rests'. Head south through Marineford to Ox Bell Plaza and you'll find Zoner getting menaced by three Escaped Prisoners. Take them down - they're a balanced group, as far as weaknesses go, but no big deal - to complete the final stage of the quiz. 

Reward: Quiz Researcher's Necklace, three Zoro's Cube Fragments, 126,000 Berries
Objective Reward: Chilly Ball

Complete all three stages of the quiz and Zoner will, once again, depart, again on her quest to usher in the age of quizzes. Perhaps we'll see her one more time before the end of the game...? And if so, what will she look like next...? Who knows...