Well.. not every flash game widgets. but it works with a lot of them.
One of the flaws in Flash that continue to this day, post Flash 10 is that it got a crappy Full Screen Transition or That it can Take lots and lots of resources. while this is a pain for Online Game Widgets (unless they are done in Silverlight). Game Widgets are mostly done in Flash and there are a lot of places where you can find them and most of the times they will lack a option to go Full Screen to begin with.
You can alleviate this niggle if you are a FireFox user with the Flash Game Maximizer Addon.
This will let you play flash games and flash game widgets in full screen to your heart content.
The Addon is still in a Experimental Status so you will need to log on into the Firefox Addon page to install it.
via CNET
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