what made it good?

Less good, more fun. To 'prove' that you were over 18 you had answer a series of multiple choice questions [1] about pop culture that most kids almost certainly wouldn't know. Pre internet, finding the answer was surprisingly hard without asking an adult. The main result was that 10 year old me knew a surprisingly large number of obscure facts of about US culture, like who Spiro Agnew was and that Ronald Reagan once starred in a movie with a monkey.

Eventually we found out that you could press some magic key combination to skip the question all together.

[1] https://allowe.com/games/larry/tips-manuals/lsl1-age-quiz.ht...

LLM knows, thus the children know. Parents know, thus the children may easily know. It sounds fun but its practical value is questionable.