When I was a kid I loved figuring out "brain teasers" and "one-minute mysteries" and the like.
But I am afraid that now, search engines have made such things almost passé.
Consider this one: When is 99 more than than 100?
It's a good puzzle. It's a fun puzzle. But it's also one you can solve in a flash, just by typing it into a search box. So, I suppose that we could see this as a test of character: Today, it's not enough to enjoy doing puzzles; you also need sufficient self-control to eschew the search engine, and figure things out on your own...