Stal Skull

, also known as , are recurring in .
==Location and Uses==
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 are a common item of . They can be found inside , , or under piles of leaves. They are also occasionally dropped by and upon defeat. Like most , can also buy them from certain , or win them with a .
 can sell for 50 each, or trade them with in exchange for . are included in the cost of the , the , the , the , the , and the .
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 are silver-rarity awarded for completing the following and of :
*, "Fewer Heart Containers!": one 
*, "Evade the Wallmaster!": one 
*, "Clear within the time limit!": one 
*, "Only Bombs-no swords!": two 
*, no challenge: one 
*, "Don't pop any balloons!": two 
They can also be won in the and , or purchased from the for 1,000 each.
 are one of the used to make the , and .
==Nomenclature==