Kinstone Fusion

Kinstone Fusion is the art of matching two complentary medallion pieces with someone else in the overworld of The Minish Cap, resulting in a completed red, blue, or green medallion with a four-leaf clover on its front. Kinstones only match with the precise complement of the other, despite the many variations and colors of kinstone pieces. Their alignment creates a form of "good luck" for Link including, but not limited to: chests containing other kinstone pieces, rupees, or inventory items, unblocked passageways, and the triggering of sidequests.

In certain areas of the overworld, like in the Castor Wilds and in the Cloud Tops, golden kinstones must be fused with specific markers such as statues or cloud forms in order to pass to the next area. The golden complements of these kinstones will always be found in the same area that requires them to be joined. Unlike the red, blue, and green kinstones which can be found anywhere, these can only be found in specific locations and can only be used where there is a specific need for them.

The Tingle siblings keep track of successful Kinstone Fusions. After all 100 are fused, Tingle will replace the Kinstone bag with the Tingle Trophy.

Rewards
Unlike most sidequests of the series, the Kinstone Fusion quest only indirectly rewards Link. The second aspect of a successful Kinstone Fusion is to actually find the reward. After a successful match, the map screen will denote the general location and type of reward.
 * Doors signify newly accessible areas.
 * People signify a character having something new.
 * Chests signify a newly appeared treasure chest.
 * Monsters signify a newly appeared Golden Monster, such as a Golden Octorok.