In the NES Adventure Island game, your powerups are hidden in eggs for some reason. The trouble is, though, that some of them are invisible. So how do you find them? Excellent question!
Check out the range you get on these stone axes.
You're going to want to throw them absolutely everywhere because occasionally
They disappear short of where they should go.
So you go to that spot
Jump
And collect whatever was in your Secret Egg
Happy hunting!