Looking to beef up your Club Nintendo coin count? How does 60 free coins sound? Tank! Tank! Tank! was released yesterday on the Wii U eShop as a free download. Downloading the game and then registering it on Club Nintendo will net you 60 free coins after completing the survey for the game. Since 60 coin surveys are typically reserved for $60 retail games, it’s likely that this is probably an error from before Tank! Tank! Tank! went free to play.
We don’t know if Nintendo will fix this or if it’s intended, so you can nab those coins for now and be glad you did if this manages to change later.