Games Like Serious Sam HD: The First Encounter

Deathmatch Classic

Half-Life Deathmatch: Source

Alien Shooter

Serious Sam Classic: The First Encounter

Serious Sam Classic: The Second Encounter

Serious Sam 3: BFE

Serious Sam 2

Serious Sam Classics: Revolution

Serious Sam 4

Heavy Bullets

Prospekt

Serious Sam VR: The Last Hope

Serious Sam Fusion 2017 (beta)

Prodeus

Serious Sam: Siberian Mayhem