Only in Europe though.
Tank! Tank! Tank! is available for free now on the European eShop after being made free in Japan last year.
Joining Zen Pinball 2, it is the second free-to-play game released on the Wii U eShop. Players can download the basic pack, which includes three modes (Monster Battle, Free For All, and Team Versus), and can be played up to three times a day.
Other content, including ten DLC packs and the discounted My Kong Mode, are also available for purchase.