It’s amazing all the great stuff available on the net these days. The trick is you just have to know it’s there. For example, HL2 uses a product called Steam to keep the software patches up to date. In the Steam Tools section, you’ll see an option to install “Source SDK”, which is all the modding tools you’ll need to create your own HL2 mod and content. How cool is that!?
For community support and an online knowledgebase, please visit the [Valve Editing Resource Center (VERC)].
More resources:
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