Well here are a few suggestions ^-^:
Call of Duty Black Ops. Modern Warfare 2. Modern Warfare 1 and World at War. (The other Call of Duty's don't really compare much to these :P).
Borderlands 2.
SUPERHOT.
Far Cry 3/Blood Dragon.
Any Doom game.
Wolfenstein The New Order/Old Blood.
Serious Sam.
Duke Nukem.
The Culling.
Homefront (Sadly multiplayer is most likely dead.).
Any Bioshock game.
Battlefield Bad Company 2 (Battlefield 3 and Battlefield 4 if you don't mind Origin :P).
Rainbow Six: Siege.
ARMA series.
The Orange Box.
Payday 2.
Red Orchestra.
Killing Floor.
Garry's Mod.
Some other games I recommend:
Rocket League
Any Fallout game.
Dying Light.
The Witcher 3
Plague Inc Evolved
Hotline Miami
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Get this one:
http://store.steampowered.com/app/344510/
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Thanks for using an alt so that people don't blacklist your main. (:
Edit: Forgot to add a suggestion. http://store.steampowered.com/app/292630/
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I would recommend:
Stardew Valley
Punch Club
Dex
Parkitect (new RCT style game in EA)
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I'll only tell you 5 of my personal favorites, but there are a lot of other awesome games too that I loved playing:
Bully: Scholarship Edition
Valiant Hearts: The Great War
Deponia
Anna's Quest
Vampire: The Masquerade – Bloodlines
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idk what game I should get, plez help..
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