Nintendo's handheld is the best-selling hardware in Japan for the week ended October 7, overtaking Sony's PSP, according to data from Media Create, GamesIndustry.biz reports.
Sales of the DS were up over 14,000 units to 87,535, while PSP sales dropped by almost 16,000 units to 86,895.
There's been less demand for Nintendo's Wii home console, with sales down by over 3000 units to 20,704 and the PlayStation 3 has also suffered with sales dropping to 10,446 units.
Reflecting Halo 3's drop in the software charts, sales of the Xbox 360 were at 1547, while the GameBoy Advance sold 242 units and the GameCube 109.
It's a numbers game, and GamesIndustry.biz can count to at least sixty.