Just found out that Trine 4 is free in the Korean region for GwG. It isn't showing on the GwG hub page yet but all you need to do is load korean store, search for Trine 4 and click get. Takes about 60 seconds and then you can begin downloading. If you follow the link i have provided you can hopefully click "stay in korea" (left) option and then just "purchase" it for free.
If not and for those who have never done this before, you simply need to change your region on the browser (bottom left of page where it says English - (Australia)), <— click there and Korea is 5th from bottom in the Asia column. Then once you have loaded Korean store Trine is free to grab. Pretty good freebie for this month!