Multiplayer first person shooter games for PC/Windows with 4-player online support

DOOM II

Players: 0 local, 4 online

Arizona Sunshine

Players: 0 local, 4 online

Borderlands: Game of the Year Edition

Players: 0 local, 4 online

Shotgun Farmers

Players: 0 local, 4 online

Quake (Enhanced)

Players: 4 local, 4 online

Sniper Elite 5

Players: 0 local, 4 online

Ghostbusters: Spirits Unleashed

Players: 0 local, 4 online

Starship Troopers: Extermination

Players: 0 local, 16 online

Crime Boss: Rockay City

Players: 0 local, 4 online

Guardians Frontline

Players: 0 local, 4 online

Echo Point Nova

Players: 0 local, 4 online

Deep Rock Galactic

Players: 0 local, 4 online

Gunfire Reborn

Players: 0 local, 4 online

Warhammer: End Times - Vermintide

Players: 0 local, 4 online

Dead Island Definitive Collection

Players: 0 local, 4 online

Borderlands 2

Players: 0 local, 4 online

Duke Nukem 3D Megaton Edition

Players: 0 local, 8 online

Blood and Bacon

Players: 0 local, 4 online

Duke Nukem 3D: 20th Anniversary Edition World Tour

Players: 0 local, 8 online

Left 4 Dead 2

Players: 2 local, 4 online

Left 4 Dead

Players: 2 local, 4 online

Warhammer: Vermintide 2

Players: 0 local, 4 online

Unreal Tournament 3

Players: 0 local, 4 online

Serious Sam: The First Encounter

Players: 4 local, 16 online

DOOM 3: OpenCoop (Mod)

Players: 0 local, 4 online