Xevious 3D/G+

Play as Tekken characters:
Highlight the "Start" option at the title screen and hold Left + X + Circle + Start on controller one to transform the ship into Heihachi. Hold Right + X + Circle + Start on controller two to transform the ship into Paul.

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

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

Black ship:
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.

Wide ship:
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.

Twisted ship:
Twist the NegCon controller to also twist the ship.

Programmer message:
When the game begins, move the Solvalou to the lower right corner and continuously bomb. Shoot down the first set of spinning disc ships when they are very close to your Solvalou to see the message.