What is an easy way to get mystery goo in Kingdom Hearts 1?

Question

I need it so I can get the Atlas thingy so i can try to get my Ultima keychain.

Answer 1

Mystery Goo:

White Mushroom (Traverse Town -> Red Room (in the Hotel)

Wonderland -------------------------> Lotus Forest

Coliseum ----------------------> Hades Cup, Seed 6

Deep Jungle --------------------------------> Camp

Deep Jungle ---------------------------> Treehouse

Agrabah ---------------------------> Treasure Room

Atlantica -------------------------> Undersea Cave

Atlantica ---------------------------> Sunken Ship

Halloween Town ------------------------> Graveyard

End of the World ---------------------> Final Rest)

Black Fungus (Agrabah, Halloween Town, Hollow Bastion, End of the World)

Rare Truffle (Monstro, Halloween Town, Neverland, End of the World)