I've been thinking about how to do a deduction game without it being Clue. I also wanted to see if I could make it a solitaire experience, which are easier for me to test.
The original intent was that some cards would have multiple clues on it and you may draw a clue that you already have. I couldn't figure out how to include logic and problem solving as an advantage in this scenario. Because the goal would be chosen at the beginning and from the same deck of cards, pulling cards from the same deck would not reduce the choices available if multiples existed.
It's a somewhat difficult thing to figure out and I'm still thinking about it.
I did come up with some rules for a multiplayer version where players negotiate with each other, in any ways, clue exchange. "I'll trade you 2 of these Location cards for 1 of your People cards," as an example. If you follow each other's progress, you may notice that they have more ideas about which People/Weapon/Location cards the goal aren't, so card trading requests aren't always measured 1:1 (i.e. if I know 4 People, then finding out the final 1 is worth a lot more than if I only knew 1 People).