To wind down the year, Microsoft has some free games to offer Xbox Live Gold subscribers in December 2017 as part of its free Games With Gold promotion. The four games in question include Warhammer: End Times – Vermintide and Back to the Future: The Game – 30th Anniversary Edition, both for the Xbox One.

Xbox 360 players – or those taking advantage of backwards compatibility on the Xbox One – can play Child of Eden (from the creator of cult classic Rez) and Marlow Briggs and The Mask of Death, a hack and slash title. If you download any of these games, they’ll be a part of your library forever.

Each game has a different availability window though. Warhammer: End Times – Vermintide is available from December 1st to 31st but Back to the Future: The Game – 30th Anniversary Edition will be available December 16th to January 15th 2018. Meanwhile, Child of Eden will be available from December 1st to 15th but Marlow Briggs and the Mask of Death will be available from December 16th to 31st.