Talk:W. D. Gaster/@comment-35021634-20180330112453

If you go through the Mysterious Door that leads to a room with the dog, the dog residue, the computer, the rope, and the puzzle (underneath the ice X-O puzzle in Snowdin Forest) if you interact with the Puzzle it says "finally, the pieces of the puzzle are coming together". I'm thinking this has something to do with Gaster, as afterwards it says that, it says "the jigsaw puzzle." which I find mysterious.