Multiplayer first person shooter games for PC/Windows with 6-player support

Unfortunate Spacemen

0 local, 10 online

Duke Nukem 3D Megaton Edition

0 local, 8 online

Tom Clancy's Rainbow Six 3: Raven Shield

0 local, 0 online

Serious Sam: The First Encounter

4 local, 16 online

Overwatch

0 local, 6 online

Serious Sam 2

4 local, 6 online

Quake

0 local, 16 online

Serious Sam: The Second Encounter

0 local, 16 online

Killing Floor 2

0 local, 6 online

Killing Floor

0 local, 6 online

Synergy (HL2 mod)

0 local, 16 online

Contagion

2 local, 8 online

Starship Troopers

0 local, 8 online

Team Fortress 2

0 local, 6 online

DOOM 3: Last Man Standing (Mod)

0 local, 16 online

Judge Dredd: Dredd vs. Death

0 local, 2 online

Mission Against Terror

0 local, 8 online

AirBuccaneers

0 local, 16 online

Hexen 2

0 local, 8 online

Combat Arms

0 local, 8 online

Serious Sam HD: The First Encounter

0 local, 16 online

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

0 local, 12 online

Coop Warfare (F.E.A.R. MOD)

0 local, 16 online

Call of Duty: Black Ops

0 local, 6 online

Serious Sam HD: The Second Encounter

0 local, 16 online