1: ) They Hunger - This mod is a classic Half-Life 1 mod. It has 3 parts and some freaky ass zombies (all the parts are already released) ModDB link : moddb.com/mods/they-hunger and here is a youtube video
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NOTE : the game also contains CO-OP so it will be cool if PewDie would play with Cry but Solo is way Creepier !!!! NOTE : i couldnt find anywhere where the story was about so sorry guys

2: ) Paranoia - it is a single-player/co-op modification for Half-life. You will play the role of a russian officer of the secret service. Your first impressions are that this mission will be just like any other, but you really have no idea what nightmares future events have in store for you... (i kinda edited the story coz first it said our mod and only singeplayer but it contains co-op too) ModDB link : moddb.com/mods/paranoia Youtube Video
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NOTE : this game has co-op too !!!!! (i think it's more fun solo)
Thank you guys for reading this post reply like (with like i mean pls rate me) and BROFIST to you guys !!!

Oh srry i didn't noticed them (both wtf ?) im kinda blind as hell !!!! thanks for replying tho