A Mario vs. Donkey Kong game for the Wii U has surfaced at the Game Developer Conference, and as of right now it is only a tech demo.

According to IGN, a company named Siliconera developed the game to showcase the Wii U's specs and developing tools. It is not a real game, but that does not mean it will stay that way. New Super Mario Bros Mii began as a tech demo as well, the site pointed out.

See a picture of the tech demo here, and view a video of it here.

There were Mario vs. Donkey Kong games for the Game Boy Advance, DS, and 3DS previously.

Wii Sports Club is getting a free weekend of play for the Wii U beginning today.

The free weekend begins at 9 a.m. PDT, and will last until March 23 at 11:59 p.m. PDT. The game's available are: Wii Sports Club's Golf, Bowling and Tennis games.

Once the promotion is over, gamers will be given options to sign up for a day pass for $1.99, or unlimited access for $9.99.

This is the second time Wii U is giving Sports Club a free weekend, and gamers who downloaded it the first time can take part in the promotion again. Also, Nintendo previously made Wii Fit U available for a month in November.

A Wii Sports Club Bundle has been confirmed for a March 27 release on the Wii U in Japan.

According to Video Gamer, the bundle will include a 32GM Wii U, Wii Sports Club, Wii Remote Plus, GamePad, and the sensor bar.