We had a discussion a while back in which we determined that a specific category of puzzles called mass-producible puzzles were off-topic if presented as specific questions.
I feel like the recent glut of "security to the party" questions count. People are saying these puzzles are original. Yes, they are different, but they are all challenge-response puzzles, with numbers and input and output, and the only substantial difference in the problem statement is in the explanation of the rule.
What does everyone else think? Can we classify these puzzles as off-topic in one fell swoop because they're MPPs?