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

Nine Parchments

Players: 4 local, 4 online

Total Annihilation

Players: 0 local, 10 online

Wobbly Life

Players: 4 local, 4 online

Dungeon Defenders

Players: 4 local, 4 online

Tom Clancy's The Division 2

Players: 0 local, 8 online

Serious Sam: The First Encounter

Players: 4 local, 16 online

Men of War: Assault Squad

Players: 0 local, 4 online

Terraria

Players: 0 local, 8 online

Lost Planet 2

Players: 0 local, 4 online

DOOM 3: OpenCoop (Mod)

Players: 0 local, 4 online

Age of Empires

Players: 0 local, 4 online

Divinity: Original Sin II

Players: 2 local, 4 online

Tom Clancy's HAWX

Players: 0 local, 4 online

Killing Floor (MOD)

Players: 0 local, 6 online

Dungeon Siege II

Players: 0 local, 8 online

Sacred 2: Fallen Angel

Players: 0 local, 4 online

Call of Duty: World at War

Players: 0 local, 4 online

Alien Swarm (MOD)

Players: 0 local, 4 online

Starlancer

Players: 0 local, 4 online

Soldiers: Heroes of World War II

Players: 0 local, 4 online

Lost Crypts

Players: 0 local, 4 online

Cobalt

Players: 2 local, 8 online

Quest Hunter

Players: 4 local, 4 online

Drox Operative

Players: 0 local, 4 online

PixelJunk Monsters 2

Players: 2 local, 4 online