For Microsoft ( MSFT) it's time to pop the champagne. The company leaped to the top of both hardware and software video-game charts for September, besting both its rivals, Sony ( SNE) and Nintendo, thanks to Halo 3, the biggest game released for the Xbox 360 console this year. The game, released on Sept. 25, sold a whopping 3.3 million copies in its first 12 days, according to data from research firm NPD. Halo 3 grabbed the number one spot on NPD's chart of the month's best-selling video games, helping Microsoft outsell its rival Sony's PlayStation 3 console by a margin of five to one, said Microsoft. Fans of the Halo series helped Microsoft sell 527,800 Xbox 360s in September, compared to 276,700 in August. The sales surge put Microsoft ahead of even Nintendo's Wii, which has been seen as unstoppable. Nintendo sold 501,000 Wiis in September, up from 403,600 last month, said NPD, while Sony sold 119,400 PS3s, down from 130,600 systems last month. Sony recently cut the price of its current 80-gigabyte model of the PS3 by $100 and said the device will now retail for $499. The company also plans to introduce a new 40-GB model, starting Nov. 2, for $399.