Splash Island

Splash Island is a Gummi Mission available in Kingdom Hearts II. Upon completion the first time through, it unlocks Atlantica for regular gameplay.

In Kingdom Hearts II Final Mix, the EX S mission requirements are:
 * Mission 1: Gummi ship must have the ability Formation Change.
 * Mission 2: Gummi ship must be a pre-made Invincible ship.
 * Mission 3: Gummi ship cannot have any weapons, but teeny ships may.