At the main menu screen press Square, Left, Square, Right, Circle, Down, Circle, Up. In the games menu choose Sole Survivor mode. Return to the main menu and begin your game.
Passwords
Ziggurat -- NAEMMAAB Backstab -- MAGDIEAH Fall N Arch -- NINKPDME Fugitive -- MJKKAMKC Rainbow -- JODPIGEH Lavapalooza -- ICJPABNA