INSURGENCY Early Access is Now Available on Steam. INSURGENCY is a first-person team-based shooter for up to 32 players designed for Windows® PC and Mac OS X (and in the future, Linux), using Valve’s Source Engine. INSURGENCY is based on the popular total conversion for Half-Life 2 – Insurgency: Modern Infantry Combat – that saw more than a million free downloads and was awarded the ModDB “Player’s Choice Mod of the Year” in 2007. It is a highly intense, realistic experience. This means no cross-hairs, realistic weapon damage, and careful maneuvering.