HOW did you do it im so confused
Look closely at the second room - WHY can't you access the exit route? It's because it is half a tile off... Where else are there walls that are half a tile off? What happens if you walk up to them?..
Now, how do I get to the other side of the room without falling down the pit?
Use either the left wall or the top wall to get half a block over to enable your exit.