Originally Posted by Fatality
until December 2, 2012,
It's also regularly available for $1.99 on the Nintendo eShop.
10 coin bonus for registering New Super Mario Bros. U, Ninja Gaiden 3: Razor's Edge, Nintendo Land (no code in the Wii U Deluxe bundle as indicated by King Broly), and Sing Party expires 12/18.
List of CN eligible Wii U games are here
. It appears that some full downloadable games, such as ZombiU, Scribblenauts Unlimited, and Assassin's Creed 3 are CN eligible while their retail counterparts are not.