Return to the Switch HOME menu, press the + button on the Mario Kart 8 Deluxe icon, and verify that the version number displays Ver. 3.0.3 . Emulation Configuration (Ryujinx & Yuzu/Sudachi)
Ensure your Switch is running a recent firmware version (18.0.0+ recommended) and the matching Atmosphere signature patches (sigpatches) to launch the updated game. Mario Kart 8 Deluxe Switch NSP XCI -Update 3.0....
: To participate in online races, players must have this version (or newer) installed. Note that local wireless and LAN play also require all participants to be on the same version. Major Features Added in the 3.0.x Era Return to the Switch HOME menu, press the
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Mario Kart 8 Deluxe Switch NSP XCI: Update 3.0.3 and Booster Course Pass Guide
: While NSP and XCI files may be used for backup purposes or by developers for testing, handling and distributing these files can lead to legal issues. Nintendo actively works to protect its intellectual property.