Sony has confirmed its new Playstation 3 console does not run some 200 Playstation and Playstation 2 software titles properly.
The PS3, which Sony calls its most important strategic product of the year, went on sale in Japan on Saturday, setting the stage for a three-way showdown with Microsoft's Xbox 360 and Nintendo's Wii.
Sony said audio features do not work on some software titles when played on the PS3, which is supposed to be compatible with games designed for its previous models, while some other titles do not work on the latest machine at all.
Shares in Sony closed up 0.9 per cent at 4,730 yen, underperforming a 1.64 per cent gain in the Tokyo stock market's electrical machinery index IELEC - but in line with Nintendo stock.
Industry specialists say the glitches appear to be the kind of hiccups that often plague console launches and are not likely to have a lasting impact on the PS3 business.
Microsoft received customer complaints following its Xbox launch in Japan in 2002 that the console was scratching game discs, while Sony's PS2, which it released in 2000, had compatibility problems with PS games.
Sony Computer Entertainment (SCE), Sony's game unit, plans to fix the PS3 problems by offering online upgrades for system software, an SCE spokesman said.
Sony sold 88,400 units of the PS3 in the first two days of the Japan launch, clearing out most stores' stock, video game magazine publisher Enterbrain said. The PS3 will be launched in North America on Friday.
Gamers in Europe must wait until March due to a glitch in commercial production of blue laser diodes, a key component of the game gear's Blu-ray high-definition DVD player.