Upon returning from the Forest Temple, you'll need to visit the Tower of Spirits again to restore more tracks. This time, you'll need to collect more Force Gems from the newly accessible floors of the Tower. These floors will introduce new Phantom types and more complex puzzles involving Phantom Zelda. Once you've gathered enough Force Gems, the Snow Rail Map will be revealed, allowing you to travel to the Snow Realm. Be prepared for the cold; while it doesn't directly harm Link, the environment presents new obstacles. You'll also encounter new types of enemies on the tracks, so be ready to use your train's cannon.
