Wave 1 didn't just bring mobile tracks; it revitalized fan favorites from the GBA, DS, Wii, and 3DS eras. The "extra quality" here is found in the modern physics integration:

Mario Kart 8 Deluxe Booster Course Pass Wave 1: The Evolution of "Extra Quality"

One of the most discussed aspects of Wave 1 was its shift in art style. While the base Mario Kart 8 game leaned into realistic textures (like the asphalt of Mario Circuit or the metallic sheen on karts), Wave 1 introduced a stylized, vibrant, and "plastic-clean" look reminiscent of Mario Kart Tour .