Earlier this month, website PlayBoxie opened a website so that PlayStation 4 and Xbox One owners could play HTML5 games through the consoles’ web browsers. The same functionality was extended to Wii U within the last week.
— PlayBoxie (@PlayBoxie) February 8, 2014
You can check out the site here. If you visit the page on Wii U, it automatically detects your console and provides a selection of titles compatible only with the Wii U controller.
Thanks to JurassicJunkie for the tip.