Defeating the Sea Creature:
Using Jeager (the scientist), dodge the water balls that the Sea Creature shoots 
and wait for it to leap out of its puddle. Quickly run over and press Square, 
electrocuting him. He will be stunned for a little while, during which time you can 
use combo attacks to beat him up. He will return to the puddle. Wait, dodge, and 
repeat again until he is defeated.

Frankenstein's puzzle:
All four hunters are locked in separate rooms. Cycle through all the characters 
until you have all their circular chambers cleared. The prisons represent the 
PlayStation2 controller. Whoever is at the topmost cell is Triangle, at the right will 
be Circle, the bottom is X, and the left will be Square. The picture designs on the 
wall represent the shapes of the buttons. Move the hunters onto their 
corresponding buttons. The crossbow is to throw you off; ignore it.

Defeating Frankenstein's Monster: 
Switch to Sundano and force every other hunter not to attack. Do not attack 
Frankenstein. Make sure your MP bar is high (attack some of the experiments to 
raise it if needed) and back away from Frankenstein. If no one is provoking him, 
his arms will slump and he will raise an electrical generator over his head and 
eventually throw it. While it is still over his head, he is completely vulnerable to 
attack. If you can see his shoulders slumping, immediately summon the Forest 
Spirit and the lion should eventually attack the vulnerable monster, knocking him 
down and dealing great amounts of damage. Followed with some combo attacks, 
you will severely deplete his HP. Before he gets up, back off quickly or else he will 
attack you. Wait until his shoulders slump and repeat the summoning and the 
combos. He should die quickly.