or make a custom image that's completely black, then make a thin line from the center to the top that is clear. Try this a few times until it's just a little bit wider than a single square in game.
Then duplicate the image three times (so you have four of the image) and rotate them until you have one for each direction.
Then make a parallel process that shows the appropriate image depending on which direction your looking in (conditional branch - player direction - display picture)
The result of this is only being able to see in front of you... But you'd still be able to see the next part of the maze all the same
I'll think about it, but I'm pretty sure to get this on one map you'd need to script it.
Unless you limit how much you can see ahead by 4-5 squares... Then you could do it with pictures.