Avenger

All weapons:
Press Up, Right, Down, Left, II, Up, Left, Down, Right, I at the title screen. All weapons will be available after pressing Run to enter the weapon configuration screen.

Invincibility and all weapons:
Press Up, Right, Down, Left, II, Up, Left, Down, Right, I, Up, Right, Down, Left, II, Up, Left, Down, Right, I at the title screen. All weapons and invincibility will be enabled after pressing Run to enter the weapon configuration screen.