Yeah..I can't speak to what engine they used...that is a question probably better asked of them. As for being an "easier thing", I think that is an assumption that is improperly applied. I would guess, as I have no idea how easy or hard for them that process was, that it is more about where our respective teams chose to put our energy. As MERACE pointed out, TGC is playable on Xbox One and PS4, as well as PC. Those platforms are simply where we have put our focus so far. We are interested in possibly doing a MAC version, but for now there are other things we are focusing on in the current versions of the game.