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.