“Select retailers” here pretty much means GameStop.
☆ NintendObs Weekly – Monday, September 1, 2014 – Sunday, September 7, 2014.
09.02.14
Want to do battle in the Hyrule Warriors game for Wii U before it’s released on September 26? Just go to select retailers to try out the in-store demo: you can battle enemy armies as Link, Zelda, or Midna and even face off against King Dodongo in a boss battle.
Availability may vary by location, so check with your local retailer before you saddle up Epona and trot off to a store.
To find a Nintendo retailer near your, check Nintendo.com.
— Nintendo What’s New
Source: Nintendo.
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…
…Wanna play? Buy a Wii U.
And if you’ve already got yours, click on Hyrule Warriors for everything you need to know about the game. 😀