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The game is for PS4, you have to buy the game.
I don't have a Playstation 4 myself so I'm not really sure how it's done, but the game is for sale on their official page https://godofwar.playstation.com/buy

It's one of the best games made this year, maybe even for all time, oppinions both from critic sites and user reviews.

Alright. Just I am an ardent game lover