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.

Mission 1
As soon as the mission starts, prepare to attack the numerous enemies on the ground for easy additional points. This level introduces two new enemies, the Submarine and Bomber. Although a bit stronger in HP, the Submarine's attacks are easy to avoid; simply remain still and allow the Gummi Ship to fly through the center of the Submarine's projected rings. The Bomber will fly onto the screen and fire numerous rockets. Shoot the Bombers down before they get too close to the Gummi Ship. Most enemies in this mission will attack in groups; especially the Knight Heads. At the end of the level a Dragonfly will appear, providing an opportunity to garner more points. This level is somewhat short, meaning the player should use a Gummi Ship that has a lot of weapon Gummis, such as the Falcon Peak. Equipping the "Draw" and "Medal Converter" Gummi Ship abilities is also helpful. Defeat all groups of red and basic Bombers in the beginning of the level to eventually spawn a gold Bomber.

Mission 2
As the level begins the camera will shift behind the Gummi Ship. Here you will encounter wave after wave of enemies that are much closer to the Gummi Ship than before, thus leaving less room to dodge attacks. A Gummi Ship with a great arsenal of weapon Gummis will do better than a defensive Gummi Ship. Again, the Falcon Peak blueprint will do well here. In the beginning of the level, defeat all basic and red Bombers to summon a gold Bomber. A Dragonfly will appear, but do not spend all time focused on it; this mission is ranked according to the number of enemies defeated, not the quality. About halfway through the level three Dragonflies will appear. Again, do not get distracted by them for there will be swarms of basic Knight Heads in the background. Defeating all groups of Shield enemies will summon a gold Shield at the end of the level. Defeat the gold Shield to earn a Large Rotor/G Gummi. At the end of the level, a final barrage of Knight Heads will appear. Keep a finger on and blast through the wave of enemies. Defeating at least 350 enemies will earn an "S" rank.