CPU vs. CPU
To see two computer-controlled opponents fight each other, try this. At the title screen hold L1 + L2 + R1 + R2. Hightlight "Player 1" and hold own. The cursor should be on "Vs. Play". With all these buttons held, press Start.
To play three levels of the classic shooter "Phalanx", hold Select + Start on Controller Two while turning on the Playstation. Use Controller Two to play.
For invincibility, go to Phalanx's option screen, highlight the speed aption and press Left/Up, L2, R2, and Triangle at the same time. The background screen should turn red. To access the game