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

Insanely Twisted Shadow Planet

Players: 4 local, 4 online

ORION: Prelude

Players: 0 local, 5 online

Sacred 3

Players: 2 local, 4 online

Aliens: Colonial Marines

Players: 0 local, 4 online

Earth Defense Force: Insect Armageddon

Players: 0 local, 6 online

A Valley Without Wind 2

Players: 0 local, 8 online

PAYDAY: The Heist

Players: 0 local, 4 online

Age of Booty

Players: 0 local, 4 online

King Arthur's Gold

Players: 0 local, 16 online

A Valley Without Wind

Players: 0 local, 16 online

Burnout Paradise

Players: 0 local, 8 online

Test Drive Unlimited 2

Players: 0 local, 8 online

E.Y.E: Divine Cybermancy

Players: 0 local, 4 online

Moonbase Alpha

Players: 0 local, 6 online

Dungeon Siege III

Players: 2 local, 4 online

Space Siege

Players: 0 local, 4 online

Fight The Dragon

Players: 2 local, 4 online

Loadout

Players: 0 local, 4 online

Construction Simulator 2015

Players: 0 local, 4 online

Avorion

Players: 0 local, 10 online

Fallout: New Vegas (NV-MP)

Players: 0 local, 4 online

Warface

Players: 0 local, 5 online

Tropico 5

Players: 0 local, 4 online

CastleMiner Z

Players: 0 local, 8 online

Homefront: The Revolution

Players: 0 local, 4 online