According to data released by Top Global Markets - a monthly report compiled by The NPD Group (US), GfK Chart-Track Limited (UK) and Enterbrain, Inc. (Japan) - Halo 3: ODST, which launched on September 22, 2009, sold 1.85 million units through September.

Of this impressive total, 1.52 million units were shifted in the US, 294,000 in the UK and just 33,000 in Japan.

For the three month period ended September 2009, it was Dragon Quest IX from Square Enix which came out as the best-seller, accumulating sales of 3.93 million in the three territories combined - the game is yet to release in the UK and US. Second is Wii Sports Resort at 3.01 million, followed by Madden NFL 10 with 2.61 million and Pokemon HeartGold with 2.07 million. Halo 3: ODST came in at fifth.

In the UK the biggest seller was Wii Sports Resort with 465,000 units.