Half-Life and Steam creator Valve have announced that the company's Source Engine and modding tools will now be made available completely free of charge. The software development kit (SDK) for the ...

A vulnerability in Valve's Source SDK, a library used by game vendors to support custom mods and other features, allows a malicious actor to execute code on a user's computer, and optionally install ...

When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. How best to describe Underhell , a mod (a game , really) for the Source Engine? Well, it's a ...