Multiplayer first person shooter games with 2-player online support

Borderlands 3

Players: 4 local, 0 online

Unfortunate Spacemen

Players: 10 local, 0 online

Duke Nukem 3D

Players: 4 local, 0 online

Halo: The Master Chief Collection

Players: 4 local, 0 online

Call of Duty: Modern Warfare 2

Players: 2 local, 0 online

Serious Sam 2

Players: 6 local, 0 online

Heretic

Players: 2 local, 0 online

Call of Duty World at War: Zombies

Players: 4 local, 0 online

PAYDAY: The Heist

Players: 4 local, 0 online

Killing Floor 2

Players: 6 local, 0 online

PAYDAY 2

Players: 4 local, 360 online

Unreal Tournament 3

Players: 4 local, 360 online

Dead Island

Players: 4 local, 0 online

Quake

Players: 16 local, 0 online

Shadow Warrior 2

Players: 4 local, 0 online

Call of Duty: Ghosts

Players: 6 local, 0 online

Serious Sam: The Second Encounter

Players: 16 local, 0 online

Resistance 3

Players: 2 local, 0 online

DOOM

Players: 4 local, 360 online

PAYDAY 2

Players: 4 local, 0 online

Call of Duty: World at War

Players: 4 local, 360 online

Far Cry 3

Players: 4 local, 0 online

Dead Island

Players: 4 local, 360 online

Conflict: Denied Ops

Players: 2 local, 0 online

Call of Duty: Black Ops

Players: 6 local, 0 online