Best steam games?

I'm looking for new games to play, as i'm getting bored with my current selection of libary games,
Can you recommend me some? dosent matter if free, or priced just any type of fun game, maybe even coop with friends

cs go, forza, ballistic, tekken, for the time being

Best steam game is garry's mod hands down, well worth it for how cheap it is

Call of duty black ops 3 zombies .

Gravity Rush.
It has awesome movement mechanics and a tube atmosphere. My impotence disappeared like a hand with this game, with all the "funny plot" and "amount of content". You shouldn't be so.