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

Serious Sam 3: BFE

Players: 4 local, 16 online

The Scourge Project

Players: 0 local, 4 online

Monster Madness: Battle For Suburbia

Players: 4 local, 4 online

Madballs in...Babo: Invasion

Players: 0 local, 4 online

Mass Effect 3

Players: 0 local, 4 online

Nation Red

Players: 4 local, 4 online

Tom Clancy's The Division

Players: 0 local, 4 online

Sanctum 2

Players: 0 local, 4 online

Defenders of Ardania

Players: 0 local, 4 online

Neverwinter Nights: Enhanced Edition

Players: 0 local, 4 online

Call of Duty: Black Ops 3

Players: 2 local, 4 online

Skyward Collapse

Players: 0 local, 8 online

Commandos 2: Men of Courage

Players: 0 local, 4 online

Diablo IV

Players: 0 local, 4 online

F.E.A.R. 3

Players: 0 local, 4 online

Sniper Elite: Nazi Zombie Army 2

Players: 0 local, 4 online

Tom Clancy's Ghost Recon: Future Soldier

Players: 0 local, 4 online

Star Trek: Legacy

Players: 0 local, 4 online

Gunshine.net

Players: 0 local, 4 online

ICARUS

Players: 0 local, 8 online

Civilization V: Brave New World

Players: 6 local, 6 online

Wanderlust: Rebirth

Players: 0 local, 4 online

Assassin's Creed IV: Black Flag

Players: 0 local, 4 online

Civilization V: Gods and Kings

Players: 6 local, 6 online

The Expendables 2

Players: 4 local, 4 online