Duck Hunt

Duck Hunt is a widget built for the Yahoo! Widget Engine, that lets users play a game of classical Duck Hunt on their desktop or in any other workspace. It is very simple to install and configure.
The interface consists of a small frame that keeps score. All you have to do is click the flying duck to "shoot" it.
From the Widget Preferences panel available through the right-click menu, you can adjust the duck speed and time before the duck flies away, enable two ducks instead of one, enable sound, as well as choose the score color.
Duck Hunt does not integrate any other settings of its own. But, thanks to the Yahoo! Widget Engine, you can set the frame to stay on top or below all the other windows, to ignore mouse events and to prevent dragging. Moreover, you can modify its opacity level.
The small widget is very light when it comes to the CPU and RAM, so it doesn't slow down overall performance. No error dialogs have been shown in our tests, and the tool did not hang or crash. However, the app does not integrate additional ducks or difficulty levels. We must also take into account that Duck Hunt has not been updated for a long time.