This was mentioned earlier today in our Mario Kart 8 Nintendo Direct Recap, but it bears repeating.
If you buy Mario Kart 8 and register it to your Club Nintendo account before July 31, 2014, you get a free Wii U game of your choosing.
Keep in mind, the selection is limited to New Super Mario Bros. U, Pikmin 3, The Legend of Zelda: The Wind Waker HD, and Wii Party U, so choose wisely.
Chances are, if you have a Wii U, you already own some of these games (if not all of them). Even so, it’s a great deal. I highly recommend Wind Waker HD if you don’t have it, and will be going with Pikmin 3 myself.
This offer applies to both the game (digital or retail), as well as that sweet Mario Kart 8 Wii U bundle, both of which release on May 30th.
Click here to pre-order your copy of Mario Kart 8 on Amazon.
Disclosure: @CripplerJones may receive a commission for purchases made through the links in this post.