Clone Invader is an arcade style game that requires either a CGA, EGA, or VGA graphics adapter. The space bar is your fire key and the arrows on the numeric pad move your base. The mystery invader is worth 50 - 300 points and the technique of always getting a 300 point mystery invader applies just like the arcade version.
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For resources that are only to be used as part of the build or runtime of the object, it is best to describe those local to those sections.