Level select
When "Press Start" appears on the opening screen, or while the game is paused, press A, R, Z, Up(2), C-Up, C-Down(2). If you entered the code correctly, the phrase "Missions Open" will appear. Then, any level and battle mode may now be selected.

Invincibility
When "Press Start" appears on the opening screen, or while the game is paused, press A, Z(2), Up, Left, Left-C(2), Down-C.

Infinite main weapon
When "Press Start" appears on the opening screen, or while the game is paused, press A, R, Z, Right, C-Up, C-Right, C-Down(2).

Infinite secondary weapon
When "Press Start" appears on the opening screen, or while the game is paused, press B(2), Z, Left(2), C-Up, C-Left, C-Right.

Infinite Solaris missiles
When "Press Start" appears on the opening screen, or while the game is paused, press B, L(2), Z, Up, Down, C-Up(2).

Infinite Titan missiles
When "Press Start" appears on the opening screen, or while the game is paused, press A, B, L, Up(2), C-Up(2), C-Right.

Infinite weapon energy
When "Press Start" appears on the opening screen, or while the game is paused, press L, Z, Left, Right, Down(2), C-Down(2).

Infinite Stealth Mantle
When "Press Start" appears on the opening screen, or while the game is paused, press Up(4), Right, Down, C-Left(2).

One hit kills
When "Press Start" appears on the opening screen, or while the game is paused, press B(3), L, R, Left, Down(2). -

Freeze enemies
When "Press Start" appears on the opening screen, or while the game is paused, press R, Z, Right(2), C-Up, C-Left, C-Right, C-Down.

Psychedelic mode
When "Press Start" appears on the opening screen, or while the game is paused, or while the game is paused, press A, R, Left, Right, Down, C-Up, C-Left, C-Down.

Wire-frame mode
When "Press Start" appears on the opening screen, or while the game is paused, press L(2), R, Z, Left, Right, C-Up, C-Right.

Turbo crazy mode
When "Press Start" appears on the opening screen, or while the game is paused, press B(2), R, Up, Left, Down, C-Up, C-Left. If you entered the code correctly, the phrase "Got it" will be spoken and a message will appear.

Gore mode
When "Press Start" appears on the opening screen, or while the game is paused, press Z, Down, C-Up, C-Left(4), C-Down. If you entered the code correctly, the phrase "Gore mode" will be spoken and you will hear a sound.

Quick start
When the first screen appears, press the reset button. When the game restarts, press Start to skip the series of opening screens.