Hm, can't really imagine how the dynamics would play out then, would have to test it to say really. I thought about adding a special ability that is maybe allowed once per game and maybe later refreshed once getting to 2048 or 4096 - An ability to remove one tile completely by clicking on it. Later on there are sometimes locks where you have to move the board in a risky direction and a tile may spawn in a place ruining your order. Being able to effectively clean it up would be a nice help in getting above the 4k mark.