Xevious 3D/G+ Cheats (PlayStation)

Hold Left + X + Circle + Start on controller one at the title screen to
  transform the ship into Heihachi. Hold Right + X + Circle + Start on controller two to
transform the ship into Paul.

Twist the NegCon controller to also twist the ship.

Highlight the "Xevious 3D" option. Hold L1 + L2 + R1 + R2 and rapidly tap Circle at the
game selection screen.

Press Square + X + Start at the Xevious title screen. The original Xevious game will begin
in debug mode.

Enable the "Black Ship" code. Return to the title screen and highlight the "Exit" option
of the configuration mode screen. Hold L1 + L2 + R1 + R2 + Start. Press Start after the
"Start" is highlighted and hold all buttons until the ship transforms.

Highlight the "Reset" option at the title screen. Hold L1 + L2 + R1 + R2 + Start. Press
Start after the "Start" is highlighted and hold all buttons until the ship transforms.