I don't see how this is a donut topology. If it were you could move off the sides and end up on the other side of the screen. Like Pac-Man or Asteroids. It's a

I don't see how this is a donut topology. If it were you could move off the sides and end up on the other side of the screen. Like Pac-Man or Asteroids. It's analog because you can move any continuous distance. Not just a discrete number of tiles.