Says there are more 9 out of 10 games on 360 than PS3 and Wii combined.

Grand Theft Auto IV screenshot

Microsoft has responded to May US sales figures by claiming victory in the GTA 4 platform battle.

It said GTA 4 on 360 outsold the same game on the PS3 by a ratio of 2:1. 871,000 copies of the 360 version of GTA 4 were sold in the US in May. "Xbox 360 continues to lead the industry with a record-breaking software attach rate of 7.7," it said.

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MS also said 360 games averaged a higher score than games on other platforms. It said it had 12 games with a Metacritic score of 90 or higher, "more than PS3 and Wii combined".

MS also pointed out that $110 million in May third party game sales means the 360 "continues to move more third party games than any other console".

It said 21 of the 25 top selling third party franchise titles with releases this generation sell best on Xbox 360. "Eighteen of those franchises were previous best-sellers, and two were exclusives, on the PlayStation 2," it said.

MS closed its note by teasing gamers with the promise of some surprises at E3. It said: "Last month we showcased an all-star line-up of games including Gears of War 2, Fable 2, Banjo and Kazooie: Nuts and Bolts, Viva Piñata 2 and Too Human. We still have quite a few aces left up our sleeve; see you at E3 next month!"