‘Half-Life 2’ mod puts the sequel inside of the original

As you might imagine, the game isn’t pretty. But, the end result might make you nostalgic for that resonance cascade we witnessed at Black Mesa in 1998. As Kotaku notes, that original toolset was a mod itself, expanding on the Quake engine’s framework. When Half-Life 2 was first released in 2004 on its newly developed Source engine, it was a benchmark for what games were capable of in terms of