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Black Box is an old asymmetric puzzle game, something like Mastermind or Battleship. One player hides particles in a grid, and the other one fires rays into the grid, and observes whether and where the rays exit.

I think it's a useful domain for illustrating abductive reasoning and/or reasoning from trace evidence and/or argument to the best explanation - and it shows off Rationale's facility for including pictures in boxes.

I believe practical reasoning, such as debugging, often occurs as a sequence of related arguments: