H.A.R.P.O.O.N (Holds Assailants Really Pretty Overly Overly Nicely) is the custom Hairdryer/Paintball Gun 2X4 Tech used by Numbuh 211104. It can fire Metal rods with rope attached for climbing and tripwires, and rope which can tie up enemies, and also disarm them. It is similar to K.O, the custom weapon of Numbuh 57.5.

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