Back in September 2023, Microsoft finally phased out Xbox Live Gold, replacing it with Xbox Game Pass Core as a new entry-level tier to its subscription service.
Unlike Games with Gold, which has now been scrapped, Xbox Game Pass Core grants subscribers access to a select list of games separate to the main Game Pass library. This list started out with 36 games, but we've had a few updates since then, with Microsoft adding a few titles to the service every six months or so.