https://www.gamespot.com/articles/free-ps4-ps-plus-games-for-december-2017-now-avail/1100-6455388/

It's officially December, and the first Tuesday of the month has brought with it a new batch of free games for PlayStation Plus members. A total of six more games are now available for download to Plus subscribers, including a total of as many as four on PlayStation 4 (or five if you're in Europe).