Masking problems are driving me nuts!

Ok so back again with another problem D:

I’m making a maze game in the dark, and you can only see a part of the maze thats in a circle (about 80 pixels in diameter) around the character(like it’s a light).
So i thought i’d use a mask of a circle and have the background as the masked layer. Everything was going fine until i wanted the circle to have the same x and y co-ordinates as the player. So that the light/mask would follow the player as he moved around the maze.
I hope that explains it.

Anyways i tried various codes and nothing will make that mask move. Then i found the mask tutorials and it says that you can’t move a mask’s x and y.
And then my head got confused.
I really don’t know what to do.

I’d appreciate the help SOOO much.