Power-ups:
Quickly press one of the following codes (shown under the default controller configuration) during
game play to make the corresponding power-up appear next to your character. Note: Each
power-up may only be enabled five times per level. 

     Shield - Down, Left, Square, Circle. 
     Two-way shot - Up, Triangle, Up, Triangle. 
     Three-way shot - Right, Right, Square, X. 
     Four-way shot - Down, Down, Up, Circle. 
     Pulse wave - Up, Circle, Down, Right, Square. 
     Turbo - Left, Left, Right, Right, Triangle. 
     Flame thrower - Down, Right, Down, Right, Circle.