According to data from UK research company, GfK Chart-Track, *four games in 2015 sold over one million copies.
Reporting a decline in Xbox 360 and PS3 game sales, which has led to a six percent decrease in physical game sales in 2015 year-on-year, Chart-Track also revealed (via MCV) those titles that flew off the shelves in the UK.
Top of the list and the best selling UK game of 2015 was FIFA 16, followed by Call of Duty: Black Ops III, Fallout 4 and Star Wars: Battlefront. Though final sales figures for each of those titles were not confirmed, each sold over one million copies in 2015. Chart-Track also reports that PS4 and Xbox One sales increased over the previous year
No surprises there then.
* Data takes into account physical game sales only