If this is right at the beginning then just wander around looking for open doors. If this is the lever part however, the key is to listen to the tones of the music as the doors shut. Each tone signifies a different door, when you get the right combination to match the melody by pulling the three levers. If you need to hear the melody again, you can always go back upstairs and pull the top lever again. I'm probobly dating myself here, but it's like the old "Simon" game where you see and hear flashing colored lights and try to remember th sequence to know what buttons to press. Good Luck!

IN THE BEGINING WHEN YOU GET THERE ,THERE ARE A VIDEO DONT CUT IT THE DOORS ARE CLOSING
BUT WHEN THEY'RE CLOSING THEY PRODUCE A SOUND IN THE FLOOR THAT IS UNDER YOU ARE 3
SWITCHES WHEN YOU ACTION THEM ,THEM PRODUCE A SOUND TOOTHE ONLY THING YOU HAVE TO DO IS
FIND THE CORRECT COMBINATION IN THE CORRECT ORDER THE SWITCH THAT IS IN THE FLOOR UP YOUR
HEAD IS LIKE A RESET SWITCH