A Mario Kart 7 (JPN) CIA is a CTR Importable Archive (CIA) file used to install the Japanese version of the game onto a Nintendo 3DS console. While the core racing experience is identical to other regions, the Japanese build features localized text, specific title screen formatting, and requires custom firmware (CFW) to run on non-Japanese consoles due to region locking . Technical Specifications
Mario Kart 7 Latest Update 1.2: What's New After 11 Years? - TikTok