Humanity is under siege again! The only ones that can stop the alien invasion are the misfit members of the Earth Defense Force and their leader – Sam “Serious” Stone.
That’s right, Serious Sam 4 is now available DRM-free on GOG.COM! Once again armed with a slew of devastating weapons and perfectly timed one-liners, you will fight your way through swarms of aliens commanded by the Notorious Mental.
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Source:: GOG – Good Old Games