Javagaming.org has one for registration. Normally one of the hard looking programing problems that are easy, or a find the mistake that is keeping the program

Javagaming.org has one for registration. Normally one of the hard looking programing problems that are easy, or a find the mistake that is keeping the program from running. Enough to look like a hard problem, even though a nonprofessional programmer gets through. Cut down on uninvested "program for free for me" threads, seo spammers (when those were a thing on forums), and spam.