Forsaken 

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.