[Support] help
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best way to learn gsc and dvars.
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Walla https://www.nextgenupdate.com/forums/black-ops-2-gsc-mods-scripts/764127-tutorial-basic-gsc-scripting.html
If you don't want to read through that (which I highly recommend you do,) You can even just look at existing files and learn what each things do messing around with stuff.
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Look at gsc dumps, try editing stock files and see your changes in action. MW2 is a good game to learn on. Iw4x is the client for mw2 and this client supports GSC loading.