Logic Grid Puzzles
A logic grid puzzle gives you a set of clues about several people or things, each with a handful of attributes (who owns what, who did which job, who arrived when), and asks you to work out the complete matching. Unlike a zebra puzzle, there's no row or sequence to place anyone in: you're matching categories to each other, not lining anyone up.
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Every logic grid puzzle here runs through a constraint solver before it's published. The solver checks every possible matching and confirms that exactly one of them satisfies all the clues; the puzzle only goes live once that is proven, not assumed. That is what the ∎ mark on each card means.