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Analysis by dataminers, such as OatmealDome , revealed the update primarily fixed a security flaw in the game's netcode, specifically a buffer overflow issue.

: Official patch notes from Nintendo Support state only that "Several issues have been addressed to improve the gameplay experience". mariokart8deluxeatualizacao303nsprar

This is for educational purposes. Update your Switch legally if possible. Analysis by dataminers, such as OatmealDome , revealed

Minor maintenance patch following the completion of the Booster Course Pass DLC waves. Analysis by dataminers

Added the final 8 courses and characters like Diddy Kong, Funky Kong, Pauline, and Peachette.

Here is a useful blog-style post detailing what you need to know about this specific update.