The September 2023 industry report is in from Circana (formerly NPD), and according to the data, the best-selling game for the month in the US was Starfield.
Released on September 6 for PC and Xbox Series X/S, the PC version was its lead sales platform (Is it because most Xbox players acquired the game through Game Pass? It's possible. - SNJ). With its release, Starfield is now the seventh best-selling game of 2023 year-to-date.
In other software news, Mortal Kombat 1 debuted as the second best-selling game of September, and it is currently the eighth best-selling game of 2023. It sold the most on PlayStation, tied for second on PC and Xbox, and third on Nintendo Switch, according to Circana's Mat Piscatella.