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by throwing a bomb flower on the boulders
I traverse town, in the ally near the Dalmatians house use red trinity on the bars and you will be in the cavern
You can't. You can only get it on Kingdom Hearts II: Final Mix +.
I'm not going any further into this cavern without a longer roll of twine! This cavern is cold and damp.
It seems as if you're asking how to beat the game, because in order to find the keyholes, you must complete the worlds. Go to Kingdom Hearts Ultimania. They have a perfect walkthrough there. It will tell you the locations for all of them.
In Kingdom Hearts II Final Mix, Frost Crystal (shard) can be found in a chest at the Cavern of Remembrance: Depths.
Emergence Cave, Subterranean Complex, Frontier Cavern, Hole of Beasts, Bulblax Kingdom, Snagret Hole, Citadel of Spiders, Glutton's Kitchen, Shower Room, Submerged Castle, and Cavern of Chaos.
I'll explore this cavern when I have a flashlight.
Space Cavern was created in 1980.
Space Cavern happened in 2600.
Cavern of the Fear was created in 2002.
The Cavern Club was created in 1957.