Mystery Force

Mystery Force is a rare Item Synthesis material found in Kingdom Hearts: Final Mix. Called "Fufilling Force" in the original Japanese version of the game, it is a more powerful version of Mystery Goo. Like its lesser counterpart, Mystery Forces are only dropped by a mushroom-type Heartless, in this case the gigantic Pink Agaricus. In order for a Mystery Force to drop, you must inflict a certain number of hits on a Stopped Agaricus before it unfreezes. Getting at least 40 hits in results in a 10% chance of a Mystery Force dropping. Getting 70 or more hits increases the odds to a 20% chance, while getting in at least 100 hits guarantees 100% that a Mystery Force will drop.

Mystery Forces are using in making two high-level items, the Ribbon and Sora's Ultima Weapon Keyblade.