Singleton traffic

Tiles cant move horizontally if theres something vertically adjacent to them.Tiles cant move vertically if theres something horizontally adjacent to them.You win when you cant move (because all the tiles are stuck) Use the arrow keys or WASD to move in a direction. Press Z to undo your last move, and R to restart the current level. ---- This is an experiment to see how a game can work with only one noun. A single repeated element with simple rules of behaviour can be player avatar, wall, and puz...