Do you just put the code in the coupon section at checkout? I keep getting an error while trying to purchase ink and Super Mario 3D World. The error is
"*Coupon code
We're sorry, but coupon does not match any of our existing offers. Please check your coupon and try again."
I've tried a bunch with no luck. The message says "Try again later" though so I'll keep trying! And to the people who took codes just to sell, you suck! Some of us actually want to play it.