Black Secret Technique

could refer to one of several techniques used by Kankurō and his puppets:
 * Black Secret Technique Flame Filling Flower
 * Black Secret Technique Machine One Shot
 * Black Secret Technique Machine Two Shot
 * Black Secret Technique — Machine Triple Shot
 * Black Secret Technique Manipulated Flame Scorpion Play
 * Black Secret Technique Revolving Flame Arson
 * Black Secret Technique: Salamander
 * Black Secret Technique: Three Great Tragedies