The folks at Nintendo report 45 percent of owners of this Internet-enabled game have used it over Wi-Fi hotspots: The company struck international deals to allow free usage by Nintendo DS owners of networks like those at McDonald's (U.S.) and run by The Cloud in the UK. They sold 112,000 copies of Mario Kart DS up until last Sunday; 52,000 unique users (who are identified by a code in the DS player) used one of these Wi-Fi Connection locations. Two more games are in the pipe for Dec. 5 and March 20 release.
Correction: The press release was apparently designed to be ambiguous. The term Wi-Fi Connection means the Web site that Nintendo designed, not the locations from which a DS user can freely use Wi-Fi. Thus, the 45-percent figure applies to any Wi-Fi user who went through the Nintendo portal, not that 52,000 users were out in hotspots. Those numbers don't appear available (yet).