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

Operation Flashpoint: Red River

Players: 0 local, 4 online

No One Lives Forever: Spy in HARM's Way

Players: 0 local, 4 online

Nom Nom Galaxy

Players: 2 local, 4 online

Tidalis

Players: 2 local, 4 online

Monaco: What's Yours is Mine

Players: 4 local, 4 online

Unrailed!

Players: 4 local, 4 online

PULSAR: Lost Colony

Players: 0 local, 5 online

First Feudal

Players: 0 local, 6 online

Dauntless

Players: 0 local, 4 online

Moon Hunters

Players: 4 local, 4 online

Generation Zero

Players: 0 local, 4 online

Minecraft Legends

Players: 0 local, 4 online

Marvel's Avengers

Players: 0 local, 4 online

Star Wars Battlefront II (2017)

Players: 0 local, 4 online

Call of Duty: Black Ops Cold War

Players: 0 local, 4 online

Din's Curse

Players: 0 local, 32 online

Dead Island: Riptide

Players: 0 local, 4 online

Osiris: New Dawn

Players: 0 local, 25 online

Titanfall 2

Players: 0 local, 4 online

Insurgency

Players: 0 local, 8 online

Dungeons & Dragons: Chronicles of Mystara

Players: 4 local, 4 online

Ring Runner

Players: 2 local, 8 online

Satellite Reign

Players: 0 local, 4 online

Unending Dusk

Players: 0 local, 4 online

Synergy (HL2 mod)

Players: 0 local, 16 online