A superstrike is a very powerful and successful hit in a game or a fight.
A superstrike is usually a very good thing and makes people excited or happy.
Examples:
He used a superstrike to win the game.
Her superstrike knocked down all the pins.
The superhero's superstrike defeated the villain.
The superstrike was so strong, it shook the ground!
With a superstrike, he could knock down a whole building!
The dragon's superstrike was so powerful, it could break mountains.