Alien Rage - Unlimited
Anomaly Warzone Earth
Anomaly 2
Assassin's Creed 4 - Black Flag
Bad North
Bastion
Batman: Arkham Asylum - GOTY
Binary Domain
Bioshock
Blue Estate
Borderlands + DLCs
Borderlands 2 + DLCs
Bravada
Bulletstorm
Chasm
Crysis
Darksiders
Deadlight
Dead Space
Defense Grid: The Awakening + DLCs
Doom (x2)
Fallout 3 - GOTY (x2)
Ghostbusters: The Video Game
Guacamelee! Gold Edition
Halfway
Halo: Spartan Assault
Hammerwatch
Helldivers
Infested Planet
The Incredible Adventures of Van Helsing
King's Bounty: The Legend
Kingdoms of Amalur - Reckoning + DLCs
Limbo
Mass Effect
Orcs Must Die! + DLCs
Orcs Must Die! 2 + DLCs
Ori and the Blind Forest
Prey
Prototype
Rage
Red Faction: Guerrilla
Remember Me
Return to Castle Wolfenstein
Rive
Seven: The Days Long Gone
Shank
Sky Force Anniversary
Spec Ops: The Line
Strider
Tomb Raider Anniversary
Tomb Raider (2013)
Toren
Tyranny
Valiant Hearts: The Great War
Vessel
The Walking Dead
Warhammer 40k: Dawn of War - GOTY
Witcher 3 + DLCs
Wolfenstein: The New Order
XCOM: Enemy Unknown + Enemy Within (x2)
XCOM 2

and too much time spent on those..

Lemmings
Syndicate
Dune 2 / C&C
Quake 3
Ultima Online
Age of Empires II
Return to Castle Wolfenstein / MP
Enemy Territory
MTGO
..
Spiral Knights
Awesomenauts
Tribes Ascend
Dirty Bomb
The Division
Rocket League

still loving those..

Geometry Wars 3: Dimensions Evolved
Lovers in a Dangerous Spacetime (Perfect Couch Coop)