Hint: Drive faster:
Press Right Analog-stick Up to crouch down and drive faster.

Hint: Extra points:
Combine flips with spins after a jump or land on only two wheels for extra points.

Hint: Speed meter:
The Speed meter controls how fast your kart can race. To increase it, always drive at full speed and make large come-backs.

Hint: Fun meter:
The Fun meter controls how well you can do stunts. To increase it, do stunts.

Hint: Karma meter:
The Karma meter keeps opponents from hitting back after you hit them. To increase it, always X to apologize to racers on your team after you accidentally hit them. Note: Apologizing to opponents too much will decrease its value.