From Homestar Runner Wiki

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Summary

A game that is only accessable by clicking the O on Strong Bad's Message Bored.

In this game, protect Strong Badia from the legions of falling Homestars. Use the mouse to move Strong Bad and click to shoot them down. Be warned that you can only have one bullet on the screen at a time, so aim carefully.

You earn 50 points for each Homestar you shoot down.