Catalogue · Logic grid puzzles

Spy Puzzles: Unfair Puzzles

Spy logic puzzles: work out which agent was in which city, carrying what — then expose the double agent. All 60 assignments put every devious clue type to work at once — conditionals, a planted lie, and statements you have to count — and then break the promise every other book here keeps: deduction alone will not finish them. Somewhere in each one you must pick a possibility, follow it, and find out. One solution each, and exactly one — but you will have to gamble to reach it. A wrong branch always collapses into a plain contradiction.