New Sega president Hideki Sato has vowed to press on with the company's radical restructuring plans.
The firm's former chief operating officer has stepped up to succeed Isao Okawa, who died last Friday.
He said January's plan to drop out of console production to concentrate on making games for other machines remains in place.
A company spokesman confirmed Sega is already making games for Nintendo's Game Boy Advance platform, which went on sale in Japan this week.
The platform is due for European release in June.
Sega also has titles in the works for Sony's PlayStation 2 console.
The company has said it will work with Sony on setting up game machines with broadband web connections for high-powered, networked gaming in stores and amusement arcades.