The Spacebar Clicker at https://space-bar-clicker.github.io/ is basically one of those simple browser tools where the whole idea is just pressing a key as fast as possible to see how your speed stacks up, and it works because the challenge turns something ordinary into a quick reflex test . It fits well into the same kind of digital habits where people try to beat their own timing or compare results just for fun, even when the task itself is extremely minimal.

Sounds like one they can have a lot of fun with!