Buck Bumble

Full health, full ammunition, All weapons: 
Press Left, Right, Up, Down at the title screen. Then hold Z and press Right(2), Left(2). A sound will confirm correct code entry. Then, press A + B + R during game play for full health, full ammunition, and All weapons.

Level select:
Hold Z and press Right, Down(2), Right at the title screen. Release Z, then press Right, Up, Down, Left(2), Up, Right(2). A sound will confirm correct code entry. A level selection screen will appear when the game begins.

Invincibility:
Hold Z and press R(2), L(2), Up, Down, Left, Right at the title screen.

Unlimited lives:
Press L, R, B, A, Z, Left, Right at the title screen. Enable the "All weapons" code. Then, press A + B + R during game play.

Play as Dark Stinger:
Hold Z + Analog-stick Up and press C-Up, C-Right, C-Down, C-Left(5), B, A, B before the opening screen appears. A sound will confirm correct code entry.

Faster text:
Press Z to scroll the text dialogue faster.

Skip text:
Press A to bypass the current text dialogue.