Way back in the day, Apple shipped several different "Mouse Practice" tutorials on their computers to teach new users how to use the mouse. Here's videos of two of them:
That game really does build up mouse skills. I remember playing it when I was 5 and having no idea what the rules were - I just liked to click all the fun little boxes with the cool numbers and bombs.
That's a great idea. Steam deck comes with a short game - Aperture desk job - that tests all of the controls. I didn't know it had a gyro until I played that game.
Some say it's why minesweeper et al were added to Windows, so people could learn how to use the mouse.