Your web browser does not support playing Unity3D games. You can either use a Windows or Mac OS X machine to play the game in the web browser, or you can get a mobile version of the game for Apple iOS devices (iPhone, iPad, or iPod Touch). Learn more at the Grumpy Snowmen site.
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Follow these steps to play in your browser.
Click the Install Now button above to install the Unity Web Player (browser plug-in).