Serious Duke 3D is a mod for Serious Sam 3 that recreates a chunk of levels from Duke Nukem 3D and the result is phenomenal.
Serious Sam 3: BFE takes the classic gameplay and puts it in a new (or updated) setting. It’s a fun, fast-paced, and action-packed romp that any shooter fan would enjoy.
Serious Sam 2 is a ridiculous, silly, and wacky shooter that retains what made its predecessors so enjoyable.
Serious Sam: The First Encounter and The Second Encounter are two of the most action-packed first-person shooters you will ever play.