Kingdom Hearts Part 4: Once We Set Sail
Lots of stuff goes down in a very short amount of time.
The islands are gone. Riku and Kairi are missing. Sora is all alone in a strange and mysterious place, and these strange things that came to the island are after him here too.
I will be providing tips on battling bosses later on, but the Shadow slipped my mind during editing. Maybe because he's not quite as hard as I thought he'd be. If you need a short rundown, it's this: He has a shooty attack that you can reflect for tech but I never manage. He slams his fist into the ground and summons heartless which you can kill for 1 tech and health orbs and he has a big bang attack where things will fall from the sky and if you touch them you take damage. Run and jump and attack and you should manage him just fine.