In Power Strike II, have both normal and special weapon levels maxed out, with one or more blue Spin Shields equipped. (Debug Mode and Dynamic Difficulty not allowed.)
In Power Strike II, start the game from any of the stages other than STAGE 1 by selecting it from the in-game OPTION screen (Debug Mode has to be turned on in the Mode Details to enable stage select.)
In Power Strike II, pause the game using the native pause function, then repeat pressing up and then left three times to go back to the game’s Main Menu screen.