You must earn 20 trophies to unlock the secret ending video.
Yes there is a secret. once you've found all the dalmation puppies you unlock a secret ending.
not that i know of
Get 100% complete on all 3 stories
No theres alot more
You start off with every character. There are no secret characters to unlock.
There is no Poseidon Kingdom. There's Atlantica, the Little Mermaid's world, but like all worlds in Kingdom Hearts, it's opened just by making regular progress in the game. There are no secret worlds in KH, just secret endings.
Yes. All versions of Kingdom Hearts 358/2 Days have the same unlockable characters. To unlock Sora, simply fill the Mission Gauge 100% for every mission on Mission Mode.
Common sence, you gotta work a little harder for better things.
Advance the storyline
I wish it was but unfortunately NO
you poeple are doodooheads