Duke Nukem Level select
At the title screen, press Left, Right, Up(2), Down, Up, Right, Left.
Invincibility
At the title screen, press Up, Down(2), Left, Right, Left, Up(2).
Duke Nukem Level select
At the title screen, press Left, Right, Up(2), Down, Up, Right, Left.
Invincibility
At the title screen, press Up, Down(2), Left, Right, Left, Up(2).