First let me answer the "too easy" crowd... If you are stopping at the 2048 tile on any version, you are missing the point. I am trying for the 131,072 tile now. You can keep challenging yourself.
To the "undo" button crowd, there are no undos in life. If you want an easy cheat version to fluff your ego, there are plenty out there.
Colors are colors, unless you're British, then they're colours. So what if that is orange and this is green? You can tell the tiles apart.
This is my favorite version because of all the things you guys are complaining about.