I don't remember the game, but then again, I don't think I have donated points before. Anyway, I went ahead and made the 70 point donation, and there is no game. You do get a cool wallpaper of a polar bear chillin' on a wall of snow though!
Here is the picture:Spoiler
That polar bear is the shizzle.
But yeah, last year there was a little interactive map type thing where you could look around and see where polar bears were and such. If you donated 70 points, it would make little diamonds show up once a day, that when clicked would award 35 points (or 70 on i think like saturday for a short time) and you could get 1 a day... so it wound up being a points-fest for alot of people who got in early and ended up with a bunch of those diamond codes