Instructions
Open the travel menu located in the main menu.
Select the "Deep Jungle" zone, based on Disney's "Tarzan".
Fly your Gummi ship to the "Deep Jungle" zone, fighting through the wave of enemies to that zone.
Go to the "Camp area" section of the "Deep Jungle" zone. It will be just a few screens away from where your Gummi ship lands.
Fight the white mushroom enemies that randomly appear here. If none are present, simply exit the screen and return. It is important to note that you will not be able to face these enemies until after you have beaten the boss for this zone.
Cast spells on the mushrooms that correspond with the actions they are displaying. Do this by selecting the appropriate spell from the spell menu during combat. If the mushroom is fanning itself, cool it down with the "Blizzard" spell. If the mushroom shivers, warm it up with the "Fire" spell. If the mushroom is thinking about lightning -- indicated by a bolt over its head -- cast "Thunder" on it. If the mushroom is twirling, cast the wind spell "Aero" to make it spin more. If the mushroom is on the ground and begging, cast the "Cure" spell to make it feel better. When you see the mushroom stop moving, cast the "Stop" spell. Finally, if the mushroom is floating about, cast "Gravity" to bring it back to the ground.
Wait until the mushroom performs the action of the spell you cast on it again. The mushrooms will continue to cycle through different issues; however, the trick is to cast the same spell on the mushroom three times in a row. This will increase the chance of getting the Mystery Goo item from 10 percent to 20 percent, after the mushroom is defeated.
For instance, you initially cast "BIizzard" on it to cool it down. Wait for it to fan itself again, and then cast "Blizzard" again. Do this one more time and you may be presented with Mystery Goo.