Full Weapons and Shields
For the ultimate in shooting satisfaction, pause your game and press Up, Up, Down, Down, Left, Right, Left, Right, B, A, Start.

Power No More
Pause the game and press Up, Select, Down, Select, Left, Select, Right, Select, Select, Select, Start.

Power Up Drain
Pause the game and press A, Left, Left, Left, Left, Left, Start.

Secret Level
In stage 4, there is a secret stage. Right below the third skull that shoots balls at you, fly to the bottom left of the screen and stay there for two seconds. Then it will take you to a secret stage.

Speed and Shields
For greater speed and protection, pause the game and press B, B, B, B, B, A, A, A, A, A.