How Do I Make A High Score Display?

Game Link:

Hello! I need some help on making a high score display for my game. In the game you use the arrow keys to dodge the toucans and collect the pizza. You keep collecting pizza until you get touched by the toucans. Every time you touch a pizza your score goes up by one. How do I make a high score display for your highest score. I would like the display to be on the levels, menu, and game. Can someone help me with this?

here’s an example grazer made.


you’re welcome