Aim and launch projectile weapons at enemies using the SIXAXIS controls and the precise firing mode on the front panel, and unleash unbelievable Ninpo attacks by tapping, painting or swiping on the rear touch screen (amazon.com)
Ryu can upgrade his sword, get more life and buy new Ninpo magic attacks between levels with the essence he collects from killing enemies but otherwise the game plays like a down and dirty action game with plot taking a back seat to ninja fighting and quick and challenging levels. (thatvideogameblog.com)
The idea of using Ninpo by shaking the controller is also a rather weak use of the Sixaxis. (hardcoregaming101.net)