They travel back to Traverse Town and find Yuffie in the First District
Yuffie: Leon’s probably at the underground cavern. He trains there
often. You know, the channel in the alleyway is connected to the cavern.
They enter the Alleyway though the Second District and find a grate at the edge of it.
They tackle the bars and enter the Secret Waterway. They swim through the channel to
where Leon is practicing his battle swing. Aerith is there with him
Leon: So, you found the Keyhole.
Sora: Yeah. The Keyblade locked it automatically.
Aerith: Good.
Leon: Every world among the stars has a Keyhole. And each one leads
to the heart of that world. There must be one in this town as well.
Sora: What do you mean?
Aerith: It was in Ansem’s report.
Leon (crossing his arms): The Heartless enter through the Keyhole and
do something to the world’s core.
Sora: What happens to the world?
Aerith: In the end, it disappears.
Sora, Donald & Goofy: What!
Leon: That’s why your key is so important.
Aerith: Please lock the Keyholes. You’re the only one who can.
Sora: I don’t know...
Leon: Seeing other worlds would probably serve you well.
Donald: Yeah!
Goofy: We gotta find your friends! And King Mickey!
Sora: I guess you’re right... Okay!
He remembers the gummi block
Sora: Hey, Leon. This gummi block’s different from the others. Do you
know what it’s for?
Leon has no answer
Aerith: Ask Cid. He should know.
Leon: Wait, Sora. Take this with you.
He gives him a stone
Leon: This stone holds some mysterious power. I’ve been carrying it
for luck. I want you to hold onto it.
Sora: How do you use it?
Leon crosses his arms, silently thinking
Sora: Uh, Leon?