http://www.ign.com/articles/2013/05/03/sleeping-dogs-free-for-playstation-plus-users

Sleeping Dogs is one of the great sleeper hits of the entire console generation (get it?), and if you’re a North American PlayStation Plus user, then you’ll be pleased to learn that the open-world sandbox game will be completely free beginning on May 7th.

Word comes from the PlayStation Blogcast, which also revealed that Pinball Arcade, Knytt Underground and Vita’s BlazBlue will also be free at some point during the month of May.