Adding dialogue to Third Crypt using hidden sprites

I added dialogue to Third Crypt using some hidden sprites on the little minimap that look identical to the underlying map tiles. Unfortunately the input for moving forward is what I want the player to interact with and so the hidden sprite method will only work for the north facing walls. I kind of like this little design conceit though so I'l' try and work it into the story.

Looking forward to working more on the game this evening and adding some characters.