Editing Thorn

[[File:Crystals.png|frame]]

'''Thorns''',<ref>{{cite|quote=Do not touch the thorns. They will knock you out! You can destroy the thorns by hitting them with eggs.|author=[[Message Block]] in [[The Potted Ghost's Castle]]|title=''[[Super Mario World 2: Yoshi's Island]]''}}</ref> also referred to as '''crystals''',<ref>{{cite|author=Williams, Drew|title=''Yoshi's Island: Super Mario Advance 3'' Player's Guide|date=2002|language=en-us|isbn=1-930206-25-9|page=51}}</ref> '''spike blocks''',<ref>{{cite|author=Williams, Drew|date=November 6, 2006|title=''Yoshi's Island DS'' Player's Guide|page=30|publisher=Nintendo of America|language=en-us|isbn=1-59812-016-6}}</ref> or simply '''spikes''',<ref>{{cite|author=Black, Fletcher|title=''Yoshi's Island DS'' PRIMA Official Game Guide|page=74|publisher=[[Prima Games]]|date=December 19, 2006|language=en-us|isbn=0-7615-5576-5}}</ref> appear in the [[Super Mario (franchise)|''Super Mario'' franchise]] as [[Spike Trap|spiky]] obstacles found mostly in [[castle]] levels in the [[Yoshi's Island (series)|''Yoshi's Island'' series]], including ''[[Super Mario World 2: Yoshi's Island]]'' (and [[Yoshi's Island: Super Mario Advance 3|its reissue]]), ''[[Yoshi's Island DS]]'', and ''[[Yoshi's New Island]]''. Touching a thorn immediately causes a [[Yoshi (species)|Yoshi]] to lose a life. A [[Yoshi's Egg|Yoshi Egg]] destroys a single thorn, but since thorns are found usually in groups and a Yoshi can carry only six Yoshi Eggs at a time, most thorn groups cannot be destroyed, though [[Baby Donkey Kong]]'s explosive eggs in ''Yoshi's Island DS'' can easily destroy a group of them in one shot. Some thorns reveal [[Winged Cloud]]s when destroyed, and in [[The Potted Ghost's Castle]], one specific thorn reveals even a door.