The game features new large-scale bosses, an online co-op mode and Trophy support.Unlike the first game, the SIXAXIS motion sensing of the PS3 controller was not used for "charging" the Ninpo magic, but instead utilized as a secret way to "jiggle" the breasts of female characters.While Sigma 2 has additional content not in the original Ninja Gaiden II a large amount of content was also removed from the game, or altered. With Team Mission Mode, the single player version is removed. Players instead are given a computer-controller partner (if without a second player or offline). In Story Mode, Karma Scoring is removed and now only done in Chapter Challenge. Tests of Valor were also removed, scattering the rewards across Ryu's chapters.