Multiplayer first person shooter games for PC/Windows with local/couch support

Left 4 Dead 2

2 local, 4 online

Left 4 Dead

2 local, 4 online

Serious Sam: The First Encounter

4 local, 16 online

Serious Sam 2

4 local, 6 online

Contagion

2 local, 8 online

Painkiller Hell & Damnation

2 local, 2 online

Gunscape

8 local, 8 online

RICO

2 local, 2 online

Serious Sam 3: BFE

4 local, 16 online

Signal Ops

3 local, 3 online

Call of Duty: Black Ops 3

2 local, 4 online

Killing, My Friend

4 local, 4 online

GRAVEN

2 local, 4 online

Reload

4 local, 0 online

Space Beast Terror Fright

4 local, 4 online

Vertigo Remastered

2 local, 0 online

Jack Walker: Ethereal

2 local, 2 online

STUFFED

2 local, 0 online

Stubbs The Zombie in Rebel Without a Pulse

2 local, 0 online

Blood: Fresh Supply

8 local, 8 online