Free logic puzzles to play and print

Logic Puzzles with Answers: Printable Pack

Choose the puzzle types and difficulty, reveal each answer on screen, or print the pack with an answer key.

Logic puzzles with answers are printable brain teasers where every solution is included, and this tool builds a mixed pack of them in your browser. It makes three types: logic grids, knights and knaves, and matchstick puzzles. It is free, needs no sign-up, and uploads nothing.

Every puzzle in a pack is checked by a solver before it is shown, and logic grids and knights and knaves puzzles always have exactly one solution, so the answer key you print can be trusted for marking. The default pack has six puzzles, two of each type, and you can change the count and difficulty to suit your group.

Teachers can use the packs in class, puzzle clubs can run them as weekly sessions, and adults or seniors can use them as brain-training sheets. The answers let a teacher or solver check work quickly.

How to make a pack of logic puzzles with answers

  1. Tick the checkbox for each puzzle type you want: Logic grid, Knights and knaves, or Matchstick.
  2. Set the count for each type from 0 to 6. The default pack is two of each type, six puzzles in total.
  3. Pick a difficulty chip: Easy, Medium, or Hard. It sets all three types at once.
  4. Note the puzzle number. The same number and settings always give the same pack. Select New pack for a different set.
  5. Work through the cards on screen. Select Show answer on any card, or use Show all answers and Hide all answers for the whole pack.
  6. Set the print options: paper size (US Letter or A4), the Name and date line on or off, and the answer key on or off.
  7. Check the preview, which shows page 1 and the first answer page.
  8. Select Print / Save as PDF. In the browser print dialog, choose Save as PDF to get a file.

Copy link shares the exact pack with someone else. If you change a count, the puzzles that stay are kept, so you can add one more without losing the others. Puzzle pages print first: logic grids one per page (two per page when both are 3x3 or 3x4), knights and knaves four per page, and matchstick six per page. The answer key follows on separate pages, with each answer numbered like its puzzle.

How do logic grid puzzles work?

A logic grid puzzle lists items in several groups, such as people, fruits, and drinks, and asks you to match one item from each group together. Each clue removes some options until only one arrangement fits every clue.

Take the example with Cara, Fay, and Gus. Fay drinks lemonade and Gus drinks milk, so Cara drinks cocoa. The child who drinks cocoa has grapes, so Cara has grapes. The child with oranges does not drink lemonade, so Fay cannot have oranges. Fay has bananas and Gus has oranges.

How do knights and knaves puzzles work?

In knights and knaves puzzles, knights always tell the truth and knaves always lie. Each statement is either true or false, and that decides who is who. To solve one, assume a person is a knight or a knave and follow their statements until you find a contradiction.

In the easy example, Cara says Kara and Gina are different kinds. Kara says Cara is a knave. Gina says she and Kara are different kinds. If Gina were a knave, Kara would be a knave too, Kara’s lie would make Cara a knight, and Cara’s statement would then be false: impossible. So Gina is a knight, Kara (a different kind) is a knave, and Cara is a knight. The answer key gives this result with the full step-by-step reasoning.

How do matchstick puzzles work?

Matchstick puzzles show an equation made of matchstick digits, and the equation is false as written. You must move, remove, or add sticks to make it true; the generator searches every possible stick change and keeps puzzles with a single answer. Digits, plus signs, and equals signs are all built from straight sticks, so think about which shapes a single stick change can create.

For example, in 5 + 7 = 2, move the vertical stick of the plus onto the 5 to make a 9. The equation becomes 9 - 7 = 2, which is true.

Frequently asked questions

How do I print logic puzzles with an answer key as a PDF?

Turn the answer key on, choose your paper size, and check the preview. Then select Print / Save as PDF, and in the browser print dialog choose Save as PDF. The answers appear on separate pages after the puzzles.

Which difficulty should I choose?

Easy uses 3x3 and 3x4 logic grids, knights and knaves with three islanders, and one-stick moves with one-digit numbers. Medium uses 4x4 grids, four islanders, and two-digit numbers. Hard uses 4x5 grids, five islanders, and mixed matchstick moves with three-term equations, so start with Easy and move up.

Can I get the same pack again?

Yes. The same puzzle number and settings always give the same pack. Select New pack to make a different one, or Copy link to share the current pack.

Is it free, and do I need an account?

It is free to use, and you do not need to sign up. Nothing you make is uploaded.

Does it work on a phone or tablet?

Yes. It runs in a phone or tablet browser with nothing to install, and the puzzle cards stack in one column. Printing and Save as PDF use your device’s own print dialog.