Thx for the effort, but: I already discovered more than is shown on your map, I think! going left, I followed the first tunnel I found - and found an exit into the open. Could not find that on your version at all. Is xkcd changing tiles?
This is pretty awesome and more easily navigable.
Best one yet in my opinion. Thanks.
Great work! Two minor problems:
1) Zooming is accompanied by a sideways wobble on Chrome/Linux
2) Solid black tiles are shown as solid white
In the original, the supposedly black tiles were actually just missing images, allowing the black background to show through. That's why they're white here. The author has used a solid background for the whole map, instead of having a black background for the bottom half.
Not sure about 1), but 2) is fixed now.
Great work, much easier to explore now! I spent far to long this morning dragging myself down a tunnel.