Mario Kart 8 Deluxe' DLC for Nintendo Switch: How to preorder

The new "Mario Kart 8 Deluxe – Booster Course Pass" will add 48 additional courses to the Nintendo Switch game across six content waves through 2023.
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Mario Kart 8 Deluxe, Nintendo Switch - U.S. Version

Wave 3 of the Mario Kart 8 Deluxe – Booster Course Pass is

Mario Kart 8 Deluxe's Booster Course Pass set for retail release

Mario Kart 8 Wave 6 DLC release time, date and NEW Booster courses

NEW RELEASE] Mario Kart 8 Deluxe + - TOG - Toy Or Game

Every Remastered Track In Mario Kart 8's Booster Course Pack Wave 1

Paid DLC for Mario Kart 8: Deluxe featuring returning courses

Mario kart booster pass downloaded but not allowing me to play

Mario Kart 8 Deluxe Booster Course - PC Nintendo Switch Digitaler

Pre-Order Bonus - Mario Kart 8 Guide - IGN