Robot select:
Successfully complete normal mode. Then, press Right, Left, Right, Left, A on controller two at the title screen. Any robot may now be selected in scenario mode.

Remove radar display:
Press Up, Down, A(2), B on controller two.

Remove enemy tracking radar:
Press C(3), Up, B on controller two.

Display destroyed enemies:
Press C, B, A, Z, Y on controller two.

Pink color:
Press Left(2), B, Left, Right on controller two.

Black color:
Press A, C, B, C(2) on controller two.

Expert mode:
Successfully complete the game under the normal and hard difficulty levels.