Microsoft Corp (MSFT.O: Quote, Profile, Research, Stock Buzz) will slash the price of its Xbox 360 game console in Japan by about 30 percent, below Nintendo Co's (7974.OS: Quote, Profile, Research, Stock Buzz) Wii and Sony Corp's (6758.T: Quote, Profile, Research, Stock Buzz) PlayStation 3 in a bid to boost market share, the Nikkei business daily.