After you install the add-on from the Marketplace, you'll see this in your HipChat right-hand sidebar (make sure you have the latest client – won't work in older HipChat clients):
image2016-2-9 12:54:31.png
When you click on the "Play Snake! glance" in the sidebar, it will launch a dialog like this:
image2016-2-9 12:55:54.png
The rest is obvious.
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