[amadeuspagel]

Nice. Have you thought about adding arrow keys?

[mpetrovich]

I hadn’t considered it since it’s mobile-first, but that’s a great idea to try!

I imagine that the arrow keys would control the movement of the empty space, right?

[amadeuspagel]

> I imagine that the arrow keys would control the movement of the empty space, right?

That's an interesting idea, and probably better then what I had imagined—that the arrow keys controls in what direction the tile that goes into the empty space moves. (The very fact that it's kind of hard to explain shows that your idea is probably better.)