by littlebro » Thu Nov 19, 2015 7:34 am
Could you be a bit more specific? I found a couple of areas where you had to walk through walls e.g. there's one with a large area on the right hand side. To get to it you have to find the spot on the left wall, which connects to the main route, and just go through.
That is the map where you progress by walking on strips of green slime (down at the bottom left, and then again a little further on) to continue the main route.
My memory is that, although in other places you can see where the path through to optional areas is by looking for gaps in the shadows thrown by the walls, you don't have that in the Tower.