Twin Pistons, called Double Upper (ダブルアッパー daburu appā) in the Japanese version, is an attack used in Mishima Style Fighting Karate and can be used by all its practicioners, with the exception of Jinpachi. The move has existed since the first game in the Tekken series. Ogre and True Ogre have a similar looking attack with the same command called Double Elbow, however, they use their elbows (hence the name) while Twin Pistons utilizes the fists. Also, Double Elbow does not launch the opponent. The original input for Kazuya was df+1,2; ever since Tekken Tag Tournament, it's instead been WS 1,2.