Nintendo really wants you to buy its upcoming Mario Kart 8 for the Wii U. They want you buy it so much that they're willing to give you a free game if you do. We're talking about an actual worthwhile Wii U game here, not another download of Urban Champion for the Virtual Console. Here's some of the press release:

People who buy Mario Kart 8 and register the game with Club Nintendo before July 31 will receive a free Nintendo eShop download code for an additional Wii U game. Players can grow their Wii U digital game collections by choosing from one of these well-received Wii U games: New Super Mario Bros. U, Pikmin 3, The Legend of Zelda: The Wind Waker HD or Wii Party U. That's a two-for-one deal featuring some of the all-time great Wii U games. This offer also applies to people who get the game in the Mario Kart 8 bundle or digitally in the Nintendo eShop.

That is an amazing deal particularly if you're a latecomer to the Wii U world.  I'd recommend you get New Super Mario Bros. U followed by Wind Waker, Pikmin 3, and finally Wii Party U if you already own the other three games.  We've seen in the past that a scrambling, desperate Nintendo is a surprisingly generous Nintendo.  History repeats itself once again.  Here's the latest Nintendo Direct presentation featuring Mario Kart 8 if you're still on the fence about the game.