Mortal Kombat 2 arcade game: Hold White and press X, Up, Down, Right, Left, Black, X at the main menu. A sound will confirm correct code entry. Play as Scorpion: Hold White and press X, Up, L, R, Left, Right, X at the main menu. A sound will confirm correct code entry. Play as Sub-Zero: Hold White and press X, Down, Up, L(2), Up, X at the main menu. A sound will confirm correct code entry.