You know the area around your house at the edge of the world quite well. However, the world is big and its edge is long. To have a look at the other parts of the world's edge, you took one month off and planned a road trip. But you just can't seem to find your car key... Luckily you've left yourself some hints where you might find it, as this is not the first time you forgot where you've put it!
See notes.txt and rop_in_c.c