I know the security code, but the door still won't open.

Hint 1 of 4:

The question is: HOW do you know the security code.

Hint 2 of 4:

At times, the game uses a bit of "intelligence" to thwart those who would
simply use a "walkthrough" to finish the game.

Hint 3 of 4:

You cannot "know" the code unless you have actually encountered Albert in the
Casino, and listened to the number he is betting.