Instead of using the antigravity mechanic in Mario Kart 8, the team originally planned to have drills on the karts so players could travel through the earth.

"In "7" we had the glider, and submersion in water, and so when we were also thinking about new ideas for "8," and we thought, "well, since we did all that, why not put a drill on the karts, and have them go through the earth somehow, subterranean racing." But, we kind of thought that's not such an interesting idea, and after that we hit upon the antigravity mechanic." - Hideki Konno
Contributed by DidYouKnowGaming