Stats from Gfk ChartTrack have unveiled that Call of Duty: Modern Warfare 2 has become the best-selling game of all time in the UK. It has finally overtaken Dr Kawashima’s Brain Training after 41 weeks of being on sale. Modern Warfare 2 has spent three weeks outside the top 10. Dr Kawashima took about 36 months to overtake Grand Theft Auto: San Andreas, the previous record holder.