Logic grid puzzle generator
The children’s version of the puzzle everyone calls an Einstein riddle: a handful of clues, three things to match up, and a grid to tick and cross your way through. Every puzzle here is solvable step by step without guessing — guaranteed, because the generator solves it with a child’s own rules before it prints. Pick a theme and a size, then download an A4 or US Letter PDF with the answer key.
Choose a theme and a grid size, preview the puzzle, then download the PDF — no account needed.
Every clue is one hand-written sentence with two names or things substituted in — nothing is assembled from fragments, so every line reads properly. “Surprise me” lets the seed pick, so Regenerate changes the cast.
How it works
- Pick a theme — pets, sports day, lunchboxes or holidays — or let the sheet surprise you.
- Choose 3×3, or the tricky 4×4, and whether the answer key is printed.
- Download the PDF, print it, or copy a share link that restores these settings.
Using these worksheets in teaching
A logic grid is the cheapest way to teach that a negative fact is information. Children asked to solve these in their heads get stuck almost immediately, not because the reasoning is hard but because “Ben does not have the cat” has nowhere to be stored; the grid is a place to put it, and the moment a child crosses that square without being told to, the lesson has landed. Teach the two moves explicitly and nothing else: cross what a clue forbids, and when a row or column has one square left, tick it and cross the rest of that row and column. Then leave them alone — the temptation to point at the next deduction is strong and it removes the entire benefit. Pairs work better than individuals here, because arguing about whether a square can be crossed is the reasoning being practised out loud. When a child finishes a 3×3 without help, hand them the 4×4 rather than another 3×3: the second grid size is where they stop reading clues in order and start choosing which clue to use next, which is the actual skill.
Frequently asked questions
- What does “solvable without guessing” actually mean?
- That every puzzle can be finished by repeatedly applying two rules a child can state: a tick rules out the rest of its row and column, and a row or column with one square left must be a tick. The generator runs exactly that procedure to a fixpoint before printing, and keeps only puzzles it finishes. Nothing here needs a trial assumption, a contradiction or a lucky start — if you are stuck, there is a deduction you have not spotted.
- Is there only one answer?
- Yes. Each puzzle is checked to have exactly one solution, so the answer key is the answer rather than an answer. The clue list is also pruned: any clue the solution can be reached without is removed, so nothing on the page is decoration.
- How hard is the 4×4?
- A real step up rather than a longer version: four items per category means six grids to keep consistent instead of three, and children who have been working one grid at a time have to start carrying a deduction across. It fills a page on its own, so a sheet holds one — ask for two and the sheet will say so rather than printing the second one overleaf where the first grid is out of sight.
- What are the themes?
- Pets, sports day, lunchboxes and holidays — four authored packs of names, things and sentences. Every clue is one hand-written sentence with two items substituted in, which is what keeps them grammatical and kind: nothing is about a real person, and no theme depends on a school system, a currency or a sport that only exists in one country. “Surprise me” lets the seed pick, so pressing Regenerate changes the cast and a shared link always reopens the same puzzle.
- What age is this for?
- The 3×3 works from about seven with an adult reading the clues through once; the 4×4 suits nine and up, or a pair. The skill is not reading ability but the willingness to write down what a clue rules out — the grid exists precisely so that a negative fact has somewhere to live, which is the whole trick and the thing worth teaching.
- Is there an answer key?
- Yes. Turn it on and the completed matching — who has what — is added as a clearly labelled page at the end of the same PDF.
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Last reviewed: July 2026. Worksheet content is generated by deterministic algorithms and covered by automated correctness tests — no AI-generated answers.