General rule: If a sub category has only one in/out spot, split the game board based on filling that spot, no matter how many worlds comes out of it most probably solve the game or reveal a huge inference.
Context Info: I got serious problem with In/Out game with sub-categories and freeze when I see one so I try to come up with general rules to apply in case I freeze. I would be grateful if you could give me some feedback and tell me what do you think about the rule. If you can think of a game that this rule does not apply to it please mention in comment so I can redo the game.
Comments
The game mentioned was exactly the mirror image (same principle, but only one allowed in instead of only one allowed out). Sure enough, there was one dietary supplement that was always forced out (N) and knowing that upfront would have eliminated most of the answer choices for at least 2-3 questions.
Splitting is the fastest, easiest way to see these kinds of inferences, so great job figuring it out and sharing for others to be aware of!