https://www.gamespot.com/articles/ps4s-free-ps-plus-games-of-january-2018-available-/1100-6455829/

Update: Psycho-Pass: Mandatory Happiness is now free on PS4 as well as PS Vita in the US. However, you may have to 'purchase' the game on PS4 and PS Vita separately, since it is not normally part of Sony's Cross-Buy scheme. The below text has been altered to reflect the change. Original story follows.

It's the start of a new month--and a new year--which means more free games are now available for PlayStation Plus subscribers. January's allotment of free PS Plus games are out now on the PlayStation Store, meaning that titles like Deus Ex: Mankind Divided and Batman: The Telltale Series have temporarily dropped to the low, low price of free for paying subscribers.