Jacksepticeye

The Hidden - INVISIBLE KILLER - Awesome Source Mod for Half Life 2 (2013x123)

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This is a mod for half life 2, but you can also play it with just the Source SDK 2007. It's an awesome mod that lets you play as an invisible killer taking out a bunch of soldiers. You alternate between the hidden and playing as a military person but sadly in this video I didn't get to play as the hidden, so this will act as sort of a first look at it. The game came out a long time ago and hasn't been updated since like 2007 but it's still great.