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I voted that they should give you a totorial so you knew what you were doing. Think about it and you might get lucky that they let you do that. Just don't get your hopes up too high unless you know someone that works on guns or whatever you were thinking to make.
get a dictionary...
Where is the best option? Which is: Yes, but Map Editor Only
If you knew anything about computers and weapon modeling you would know that your idea is impossible. The only thing that could happen is we could make our own maps.
Right before you play Splinter Cell Chaos Theory you are FORCED to pass a test on how to play on Xbox Live. I thought that was cool. The Map editor might not handle so hot, I voted no.