Printable Logic Grid Puzzle (Free PDF)
The classic deduction puzzle: a clue list, a cross-off grid in the usual stepped layout, and one answer that the clues really do force.
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Four students, four Saturday workshops and four start times, plus a snack each in the harder version. The clues tell you what cannot be true as often as what is, and you work them with the stepped grid printed above them: a cross when a pair is ruled out, a tick when a pair is certain, then the rest of that row and column crossed off. The easy puzzle pairs three categories and prints seven clues; the hard one adds a fourth category and prints nine.
The clue list is generated rather than written. Every true statement the puzzle could make is enumerated, each one is matched against the full set of possible arrangements, and clues are added until a single arrangement survives. The set is then thinned again, with each clue removed in turn and put back only if the answer stops being unique, so every line on the page earns its place and the puzzle is solvable by deduction alone.
Page two prints the completed grid with a mark in every square, plus a plain table of who takes which workshop at which time, and which snack they brought in the harder version. A short method note sits underneath for anyone solving their first grid puzzle, explaining why one confirmed pair lets you cross off a whole row and column inside a block. The puzzle page has a name line at the top and nothing to type into, so it prints as a class set or a quiet activity for one.
