Nintendo shares have soared after its new console stole the show at the E3 games expo in Los Angeles.
The Wii controller especially lends itself to sports games
The Wii (pronounced "we") grabbed attention with its controller based on motion sensors rather than buttons.
The positive reaction, coupled with news that it will hit the shops before Christmas to compete with the Sony PlayStation 3, encouraged investors.
Nintendo shares climbed 6.2% to 19,710 yen having gone as high as 19,890 yen - its highest level since April 2002.
BBC News website technology editor Alfred Hermida said that the Wii overshadowed Sony's much vaunted PS3 at the expo.
But Nintendo did depart the show with one question about the Wii left unanswered.
Unlike its rival Sony, the company has not revealed how much its console will cost, although most analysts expect a price between $200 and $300.
The PS3 will arrive in November and cost $499 (499 euros) for a basic model with a 20GB hard drive.