I'm actually stuck in that game. It's early on and I can't seem to get past one area. I think I'm just approaching it wrong. There's a log and a bridge. You seem to have to get the timing just right to get past it. I'll take another look.
You can go to the Wii menu on the Wii U. I believe once that launches, you can redeem the codes emailed to you there. There's a "Learn more" link on both of the games' pages.