Unlock Hints:
Kiba's Letter 1 page: Collect 1 million gold gems. Find Galileo's book in front of the castle for another set of battles.
Kiba's Research 1 page: Defeat the fake Doodle Kings after finding Kiba's Letter 1 page and Galileo's book to unlock the Kiba's Research 1 page.
Kiba's Research 2 page: Defeat the doodles from the Kiba's Research 1 page.
Kiba's Research 3 page: Defeat the doodles from the Kiba's Research 2 page.
Kiba's Letter 2 page: Defeat the doodles from the Kiba's Research 3 page.