Blackout is an alpha-stage mod for Doom source ports Zandronum and UZDoom, created by modder PKmX. It emphasizes tactical military simulation with slow, methodical gameplay, encouraging players to use cover and breaching techniques. The mod features mechanics inspired by the Crysis series, including an energy suit with a damage-absorbing shield, an adrenaline system for speed boosts, and a cloaking device for stealth. PKmX recommends complementary mods, such as a palette mod to enhance the dark atmosphere. Blackout aims to redefine player engagement in the Doom universe by blending strategy and horror.