Multiplayer first person shooter games with 4-player online support

Borderlands 2

Players: 4 local, 0 online

Left 4 Dead 2

Players: 4 local, 0 online

Halo Reach

Players: 4 local, 360 online

Borderlands: The Pre-Sequel

Players: 4 local, 0 online

Left 4 Dead

Players: 4 local, 0 online

Left 4 Dead 2

Players: 4 local, 360 online

Halo 3: ODST

Players: 4 local, 360 online

Warhammer: Vermintide 2

Players: 4 local, 0 online

Call of Duty: Ghosts

Players: 6 local, 0 online

Unreal Tournament 3

Players: 4 local, 0 online

Serious Sam: The First Encounter

Players: 16 local, 0 online

DOOM II

Players: 4 local, 0 online

DOOM 3: OpenCoop (Mod)

Players: 4 local, 0 online

Halo: The Master Chief Collection

Players: 4 local, 0 online

Left 4 Dead

Players: 4 local, 360 online

Call of Duty: World at War

Players: 4 local, 0 online

PAYDAY 2

Players: 4 local, 0 online

Call of Duty: Advanced Warfare

Players: 4 local, 0 online

Borderlands: The Handsome Collection

Players: 4 local, 0 online

Halo Infinite

Players: 4 local, 0 online

Halo 4

Players: 4 local, 360 online

God Mode

Players: 4 local, 0 online

ORION: Prelude

Players: 5 local, 0 online

Tom Clancy's Rainbow Six Vegas

Players: 4 local, 360 online

Evolve

Players: 4 local, 0 online