Okay people, before I get confused like all of you are, let me get things straight.

Riddle 42 has only one level. And yes, Gigs is right, you get it from a video.

Now, we are talking about level 43 and crookedhalo's idea is right. There are several sub-levels to 43. And james28, we believe that you are already referring to the last part of 43 which is supposedly the easiest part. The password that you are looking for has already been given to you at the start of this level.
There you go. Hope that clear things up.