I don't Remember the game name! Thread

So there is this Zombie game there is the black smoke thing that makes people zombie i remember the game it was DEMO,demo of the game i remember the begining,where you woke up next to a cop car i guess you had a hand gun and a gas mask and a light then it was dark,lot of black smoke the some made people zombies or something and a first aid kits  then you found some kind of super weapon and there that can kill the black smoke or something and the smoke made all these people zombies and there was probably some woman who called you to tell you something about it,i'm not sure if it was 2010 summer or 2011 summer when it was released i remeber xboxahoy a youtuber made a video about it and pbat but i don't remember the game name and don't find anything of it any more like it was never made it was just a DEMO,i liked it but now i realised that there was this game but i haven't seen anything of it since then and the game intro was some black white cube thingy probably...
i know that dosent make any sense this text but if any of you remember or know that game i would like to play the demo again

FPS,PC only.
in the begining you will wake up on a street next to the cop car and you didn't know what happend it's a mess you walk around and there is a "person" on the ground you go near him he wakes up and idk if you knew that you had to kill him or someone told you to kill him and it's a zombie and alot of them and they are very strong like few hits and you start again,after passing few cars you find cop car with a pistol looked liked 1911 and some ammo then you find the gas mask to run away from the smoke or already had it idk and the lighter part i don't know of that for sure...after that i can't remember for sure but you probably have to kill alot of zombies untill the street is blocked with cars,vans,trucks and you go to a hallway that is the only way to go then there are some zombies again then there is a ladder you have to climb up to balcony and go inside a house ... then you go out on a roof and run on some building roofs and find a open window you will go inside there and there are about 5 rooms and one of the rooms has this plaster gun with blue glowing ammo i think it is a pretty high detaild rooms then you go out again from another exit you are on the balcony there are zombies in the yard umm...like a yard in city houses around it you climb down and try your new weapon i did that then you get to the street again a o on the roof after first house you got in sun came out and it was all cool ... so you are on a street again and you see zombies and there is this black smoke what goes over them and the zombies become stronger or something and then you kill them and probably go into the black smoke and continue and that's where it ended.That DEMO was very fun and it was intresting idk what happend to the game/demo i don't remember the game anymore cause it was a DEMO...

OMG NVM i finnaly found it LOLOLOLOL just didnt look around enough

He won't tell us.We didn't tell him either.