Walkthrough:Kingdom Hearts II/Atlantica

First Visit (Swim This Way)
Like in the first game, and his friends transform in this world. regains his blue dolphin tail, re-obtains his octopus legs and  becomes a turtle again. finds them, though has forgotten how to swim (due to his stasis). The help text will teach you how to swim. Talk to.

A musical is near, and is acting strange. asks you to join in on the musical, which and  agree with. You'll be put on a tutorial round, where you must hit the button to get a Good or Excellent. You need to have at least one to pass. You can try again if you fail.

After you complete this, you'll be ready to perform Swim This Way. You need to have at least one note to clear this song, and you can get up to five notes. Getting an Excellent grants you a note, while getting a Bad takes away one note. After completing the song, you will be re-introduced to, who asks to try to keep 's mind off of the human world. Later on, finds a statue from a newly-sunken wreck. However, and his friends cannot lift the rock out of the way. You'll then return to the, where the help text tells you that, in order to go further in , you'll need to have the Magnet Spell, which can be obtained as early as after defeating in.

Second Visit (Part of Your World)
After you obtain Magnet, a new chapter will be unlocked in.

After landing, go talk to, and select the second choice. A cutscene will begin.

and his friends have managed to move the statue into the. will then begin to sing "Part of Your World" after relising that she might be in love with a human prince. To clear this song, you need to perform 5 Excellents in a row. Some of the notes require you to press.

After completing the song, offers to help, as that's what he's here for, anyway. Meanwhile, completes the song that  asked for, which is said to help  take her mind off the human world, as well as show her how happy it is to be under the sea. However, when shows the song to,  and , it makes them a little nerveous.

To continue on with, you need to have your drive gauget at 5, which will happen after defeating the in.

Third Visit (Under the Sea)
After you clear for the first time, a new chapter will be unlocked in.

Talk to to begin this song, called Under the Sea. To pass, you need to raise mood by pressing  when the gauge is nearly empty, like with all other songs. Easy, right? No. For the tricky part, you must NOT press when the character in the gauge is ; just let it run out to get an Excellent. Sometimes, a gauge will start as, then sudden switch to , so be careful. Other than that, enjoy the song.

After clearing the song, you'll see that 's very impressed with the song... too bad it's not the song she wants to sing, much to 's horror. She wishes she could sing about how the land and sea can live in harmony. tells her that if she sang a song like that, the king will make chowder out of him, causing to quit the performance. then mutters that has fallen in love at not only the worst possible time, but with a human, which is overheard by, who then becomes furious...

Meanwhile, heads towards the surface, along with,  and , where they spot a prince wandering the beach. asks if they should say "hello", but tells him not to, since the prince is a human and she is a mermaid. The prince then drops something into the water, which then heads over towards some rocks. The quaret try to grab it, but it's out of reach.

To continue on with, you need to have Magnara, which can be obtained as early as after the second battle with the in.