I know you can use it in Death Mountain Crater where those rupees are. You can use it in the fire temple where those boulders are rolling all over the place, and at Lake Hylia close to the fishing pond. There are others, I know, but I haven't used 'em yet. Just play it when Navi/Tatl flies to a place that you can't reach originally.

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Previously: wookieman64 & arwing_ace.