Cheat mode:
Enter one of the following codes at the title screen when "Press Start Button" appears. The screen will flash to confirm correct code entry. Note: Enabling a cheat will disable saves. Also, the Combat Skills Training levels will not be available, unless its code is used.

Level select:
Press R, Y, Left, B, X, L, Left, Up, A, Down, L, X.

All Combat Skills Training levels:
Press X, Up, L, Left, Y, A, R, B, Right, R, X, B.

All weapons at full power:
Press Up, Down, A, X, R, Y(2), Left, B, L(2), Right.

Full Beam:
Press Left, B, Y, Right, L, X, Left, R(2), Y.

Full Bolt:
Press Left, Right, Up, Down, L, B, Y, R, Left, Down, X(2).

Full Spread:
Press L, R, B, L, Down, Up, L, Right, Left, A.

Full Homing:
Press Right, Up, X, L, Left(2), L, Left, B, Left.

Full Area Effect:
Press Left, A, Y, Up, A, Down, X, L, Left, R.

Do Not Drop Weapon Levels:
Press Down, Up, A, X, Down, Up, A, X, L(2), X, B.

Invincibility:
Press Right, A, R, Y, Up, L, A, Left, L, B, A, R.

Boss mode:
Press R, Y, Down(2), A, L, Left, X, Right, Y, R, L.

Agent data:
Press Up, Down, B, R, Left, L, Right, A, R, X, Up, R.

Alien data:
Press X, L, B, L, Down, Y, R, Right, A, Left, R, Y.

Making Of FMV sequences:
Press B, L, R, B, Y, Down, X, A, Right, L, A, Up.

Hint: Better guns:
Get better guns by using Agent K.

Hint: Faster speed:
If you want to be faster, use Agent J.

Hint: Defeating Bosses:
When fighting the Bosses, it is just as easy to use your pistols as any other gun.