I'm not quite sure, but i think i can help...
A source code is the coding for a game. Basically a whole bunch of 1's and 0's (I think, i know it's hex code...)
The source code determines ship values, game engines, hitpoints, hardpoints, etc, etc...
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"Your job is not to die for your country, your job is to make some poor dumb bastard die for his!"- Patton