Multiplayer first person shooter games with 6-player online support

Duke Nukem 3D: 20th Anniversary Edition World Tour

Players: 8 local, 0 online

AirBuccaneers

Players: 16 local, 0 online

Hexen 2

Players: 8 local, 0 online

Brink

Players: 8 local, 360 online

Resistance 2

Players: 8 local, 0 online

Combat Arms

Players: 8 local, 0 online

Serious Sam HD: The First Encounter

Players: 16 local, 0 online

Star Trek Elite Force 2 (HZM Co-op Script Mod)

Players: 12 local, 0 online

Call of Duty: Black Ops

Players: 6 local, 0 online

Serious Sam HD: The Second Encounter

Players: 16 local, 0 online

Marathon: Durandal

Players: 8 local, 360 online

Call of Duty: Ghosts

Players: 6 local, 360 online

Brink

Players: 8 local, 0 online

Gunscape

Players: 8 local, 0 online

Insurgency: Sandstorm

Players: 8 local, 0 online

Serious Sam 3: BFE

Players: 16 local, 0 online

Call of Duty: Ghosts

Players: 6 local, 0 online

America's Army: True Soldiers

Players: 16 local, 360 online

Gunscape

Players: 8 local, 0 online

Brink

Players: 8 local, 0 online

Overwatch 2

Players: 6 local, 0 online

Counter-Strike Nexon: Zombies

Players: 12 local, 0 online

Serious Sam Collection

Players: 16 local, 0 online

Duke Nukem 3D: 20th Anniversary Edition World Tour

Players: 8 local, 0 online

Call of Duty: Ghosts

Players: 6 local, 0 online