What does "game changer" mean?

A visionary, innovative person who changes the way people think of a situation.

Game changer

Common synonyms include: breakthrough device, changers, disruptive technology, epoch-making events, revolutionary act, revolutionizer.

noun

noun ·Rare ·Advanced level

Noun

1
A visionary, innovative person who changes the way people think of a situation.
2
An innovative idea, product, event or procedure which changes the rules of a process viewed as a game. figuratively, literally
"Improved drug testing has been a game changer for many sports."

"Improved drug testing has been a game changer for many sports."