1.

Zelda's spirit can possess a Phantom — direct her to hold switches while you advance.

2.

Train travel is required — upgrade your train cannon to defeat enemies on tracks.

3.

The Tower of Spirits adds new floors each time you restore a track route.

4.

Rabbits hidden across New Hyrule unlock train car upgrades when caught.

5.

Blow into the DS microphone to play the Spirit Flute.