>>715399238A kart racing game with a much higher skill ceiling, CTR, has its own Blue Shell equivalent, but there are ways to deal with it if you're in 1st place. In CTR's case, a racer who is skillful enough won't ever have the orb catch up to him. In Mario Kart's case, a skillful racer will have ways to negate the Blue Shell or otherwise will be smart enough to not be such easy pickings. It's a good equalizer with plenty of counterplay in recent releases.