Non-attacking Heartless that are rarely found. They like to jump, so helping them stay in the air may bring good things.
Strategy This Heartless cannot be defeated.
When attacked it will jump into the air. You must strike it before it lands to receive EXP. The amount of EXP you receive depends on how many times you manage to strike it, without allowing it to touch the ground. If you manage to execute a long series of successful strikes you will also be rewarded items. The Rare Truffle will disappear after you have stricken it 100 times, or once it touches the ground.


http://www.eyesonff.com/kh/mushrooms.shtml

The mushrooms drop mystery goo.