Force Gem
Force Gems are items in many Zelda games. They have many uses as outlined below.
Appearances
Four Swords Adventures
In Four Swords Adventures, Force Gems are found throughout Hyrule, and must be coolected by the player in order to create enough power in the Four Sword to break Vaati's seals, which are found at the end of each sub-level.
Phantom Hourglass
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Spirit Tracks
Force Gems don't appear until the middle of Spirit Tracks. They are acquired through various side quests and are used to expand the Spirit Tracks. Force Gems are a sign of extreme happiness or gratitude, concentrated into a triangle-pyramid shape. Link can gain a total of 20 Force Gems in the game, with two of them being mandatory to finish the game. When Link gains a Force Gem, his Rail Map starts to glow, and the section in which he completed the quest (most of the time) gains a new set of rails, usually leading to a new station or a bunny.