Go to your game page and click 'Edit Game'.
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Hey Yang, actually a follow up question for this and I'll hijack this related post! :) I understand we can bug fix and tweak things based on feedback, do we also need to update our source when we do that? I ask because I used google drive and it's a 2GB zip file at the moment lol :) I mean maybe the original is a better reference anyway? I suppose the other alternative is a well documented dev log on changes so anyone curious enough to tinker can actually see the original versus the changed versions :)