Halo: Reach sold 3.3 million copies in the US during its launch month of September, according NPD figures provided by Microsoft.
Bungie's Halo farewell is only the third game this console generation to surpass three million unit sales in its first month, the others being Halo 3 and Modern Warfare 2.
September's top ten games (Physical retail only; all platforms incl. PC):
01. Halo: Reach (Microsoft - Xbox 360) 3,300,000
02. Madden NFL 11 (EA - 360, PS3, PS2, Wii, PSP)
03. Dead Rising 2 (Capcom - 360, PS3, PC)
04. NHL 11 (EA - 360, PS3)
05. FIFA Soccer 11 (EA - 360, PS3, PS2, PSP, NDS)
06. Kingdom Hearts: Birth By Sleep (Square Enix - PSP)
07. Mafia II (Take-Two - 360, PS3, PC)
08. Spider-Man: Shattered Dimensions (Activision - PS3, 360, NDS, Wii)
09. Metroid: Other M (Nintendo - Wii)
10. Call Of Duty: Modern Warfare 2 (Activision - 360, PS3, PC)
On the hardware front, Xbox 360 outsold Wii and PS3 in the US for the fourth month in a row in September.
Earlier this week the NPD Group announced plans to restrict free press access to monthly hardware unit sales figures or sales numbers for the month's top five games, beginning with September's market data.
However, the platform holders that do well each month will likely provide us with some sales figures, while NPD analyst Anita Frazier will include software sales numbers for various new releases in her monthly coverage. Other people who actually pay for the data like analyst Michael Pachter are bound to throw a few numbers our way too.
We're particularly keen to see how PlayStation Move performed last month in the States, and we'll publish any additional sales information as it comes in.