It's routinely featured in Japanese equivalent of SAT tests. So anyone with a high school diploma at least have heard about it, most with a degree from a Japane

It's routinely featured in Japanese equivalent of SAT tests. So anyone with a high school diploma at least have heard about it, most with a degree from a Japanese university have made attempts to solve a quiz involving it, and anyone with any degree from any of national universities have solved a question on that topic at least once.