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.
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