Humanity is under siege, as the hordes of Mental spread across the globe, annihilating the remnants of a broken and shattered civilization. The last obstacle in the way of the invaders is the Earth Defense Army, led by Sam Stone, known as "Cool Sam," and his heavily armed squad of soldiers.

Croteam returns with a powerful prequel to the Serious Sam series, escalating the chaos to unprecedented levels. The classic formula of Serious Sam is updated with an unstoppable arsenal and an unimaginable number of enemies, challenging and inviting players to dance in a deathly ballet.

HORDES OF INVADERS

The iconic alien invaders are back, and this time with reinforcements! Break through incredibly massive armies of Mental’s minions, including the already familiar Headless Kamikazes, Headless Rocket Men, Skeletons with Cleavers, Utility Rocket Men, Syrian Bull Werewolves, and Hnoms! You'll also face new enemies, such as the frenzied Processed, repulsive Retches, unflinching Advocates, and many more.

EXPLOSIVE ARSENAL

Armed with a ton of destructive weaponry, choose the most suitable tools for the situation. Sow chaos among Mental’s army with a powerful double-barrel shotgun, a punishing minigun, a terrifying chainsaw gun, the latest automatic shotgun in the series, and the iconic cannon. Upgrade your toys and revel in the ferocious beauty of a guided missile launcher and the mighty death ray laser.

COOPERATIVE CHAOS

Take on a battle-filled campaign with friends in a 4-player cooperative mode! Complete thrilling missions and engaging side quests across various difficulty levels.

LEGION SYSTEM

Serious Sam 4 unveils one of the most significant moments in the series’ history with the new Legion System and battlefields teeming with thousands of enemies!