Enemy Zero

enemy zero

I HAVE A BIG PROBLEM AND I DON'T KNOW WHO TO TURN TOI PLAY THE ENEMY ZERO, BUT I CAN'T SOLVE THE CODE IN FRONT OF THE "RONNYS" DOOR. YOU KNOW? THE PLACE WHERE IS A DOOR AND SOME KIND OF A HINT TO SOLVE THE CODE IT'S IMPOSSIBLE CAN'T FIGURE IT OUT SO PLEASE HELP MEI ALSO HAVE PROBLEMS WITH THE OTHER "HOW-TO-GET-IN-TO-A-ROOM" MISSIONS TOO