Free Detective Logic Puzzles with Answers

These are five free detective logic puzzles for kids aged 8 to 12, with a printable PDF of the cases and a separate answer key that explains every solution step by step. Each mystery gives you a short story, a list of clues and one question. There is nothing to look up and nothing to guess: the clues prove the answer. You can read the first case on this page right now, and every PDF is free to download with no email address and no signup.

Download the free PDFs

Both files are US Letter, black and white and easy on the printer. Every case has an ID such as DL-01, and the answer key uses the same IDs in the same order.

The answer key is a separate file on purpose, so nobody sees a solution while they are still working on the puzzle.

What is a detective logic puzzle?

A detective logic puzzle (also called a logic deduction puzzle) is a mystery that you solve by reasoning, the way a detective would. You are told who is in the story and what they might have done, seen or owned. Then each clue gives one true fact. You put the facts together until only one answer is possible.

The word logic matters. A good case does not ask you to know something you were not told, such as what a person usually does, and it does not hide the answer in a trick. If a case says that someone sat at the Oak desk, you can use that. If it does not say, you cannot assume it. The five cases below practise five different kinds of reasoning, from simple elimination to chains of deductions where each step opens the next.

The five cases

The cases go from the gentlest to the most demanding. A child who has never solved a puzzle like this can start at DL-01 and work through them in order. Older or more experienced solvers can go straight to the Medium cases.

These work as printable detective puzzles for kids at home, as solve-the-mystery worksheets for a classroom or library club, and as a screen-free activity for a car trip or a rainy afternoon.

Try a case now

Here is the first case in full. Read the story, work through the clues and decide on your answer. The explanation is further down the page in a section marked as a spoiler, so you will not see it by accident.

If you want somewhere to write, the PDF has a notes page for this case, with a table to fill in. On paper, a good first step is to draw that table yourself: the people down the side and the rooms across the top.

How to reason through the clues

Almost every detective logic puzzle can be solved with the same handful of habits. You will use all of them in the five cases.

1. Write down what is certain. If a clue says "Cleo was in the Gem Gallery", write it in your table at once. Certain facts are the only ones you may build on.
2. Cross out what is impossible. A clue such as "Dev was not in the Gift Shop" is just as useful as a positive one. Cross the choice out so you never use it again.
3. Use up the choices. If every person has a different room, then once a room belongs to someone, nobody else can have it. When only one room is left for a person, that room is theirs.
4. Watch the order. Some clues are about time or position: "before", "after", "exactly 15 minutes later", "right next to". Draw a line with one space for each time or place and place the people on it.
5. Combine two clues. When one clue cannot help yet, hold it. A fact from another clue may turn it into a certain answer. This is how the harder cases work.
6. Check your answer against every clue. A real solution makes all the clues true at once. If one does not fit, something earlier was wrong.

If you would like a longer walk-through with a full grid, see our guide on how to solve a logic grid puzzle, which follows one puzzle from a blank grid to the answer.

Tips for parents and teachers

• Let them struggle a little. Getting stuck and then seeing the way through is where the learning happens. Wait a few minutes before offering help.
• Ask, don't tell. "Which clue tells you that?" and "What do we know for sure so far?" work better than pointing at the answer.
• Talk it through afterwards. Ask the solver to explain their route out loud. Then compare it with the step-by-step explanation in the answer key. Different routes are fine; only one answer is possible.
• Use pencil. Crossing out and changing your mind is part of the method, and the notes pages leave room for it.
• In a group, hand out the same case and let pairs compare how they solved it. Or give different cases to different pairs and let each pair present theirs.
• Match the level. DL-01 suits a first-time solver. DL-02 and DL-03 add ordering and matching. DL-04 and DL-05 need several clues at once and suit confident 10 to 12 year olds and adults.
• Printing: use US Letter paper (or A4 with "fit to page"), black and white, and print the answer key separately.

Check the sample answer (spoiler)

This section is the only place on the page where a solution is shown. It covers the sample case above. The answers to the other four cases are only in the answer-key PDF.

Enjoyed these mysteries? Explore more

If you liked these, there is more to solve. Our two detective books are written for teens and adults, so they suit an older sibling or a grown-up who wants to play along:

• The Detective's Logic Casebook has 40 original mysteries, each with clues, a ready-made logic grid, layered hints and a full explanation. It also has a free pack of three printable cases.
• Detective Mystery Word Search turns each case into a word-search grid, where the words you find are the evidence. It has a free pack of five printable cases as well.
• Logic and detective puzzle books compares the two side by side.

For younger solvers there are more free worksheets on the free printables page, including printable Sudoku for kids, another way to practise careful, step-by-step thinking.

How the puzzles were made and checked

The five cases are original. They have new characters, settings and clue structures, and they were written for this page, not taken from our books, their free bonus packs, other sites or other publishers' puzzle books. The cases were built around one rule: the answer must follow from the clues, not merely be the most likely suspect.

To make sure of that, each case was written as structured data and then proved by a program, and the proof was repeated by a second, independently written program.

• 5 cases, 29 clues, 25 explanation steps. Each case is stored as data: who and what is in it, every clue in a machine-readable form, the printed solution and the explanation.
• One answer, and it is the printed one. A program tried every possible arrangement (up to 5 people, so thousands of them) and found that exactly one satisfies all of a case's clues. That arrangement is the one in the answer key.
• No clue is filler. For every clue, the program removed it and confirmed that the remaining clues then allow more than one answer.
• The explanations are honest. Every conclusion in a step-by-step explanation was checked to follow from the clues that step cites plus the earlier steps, with no unstated assumption.
• The story matches the logic. Each clue's sentence must name every item its logic uses, and nothing else. A second, independently written checker repeated the whole proof and agreed.

A program can prove that the logic is right; it cannot prove that a sentence reads well. So the wording of every clue was also reviewed against its logic, to confirm that it says what the logic says and that a solver needs nothing else to understand it. If you ever find a clue that seems unclear or a mistake in an answer, please get in touch and we will fix it.

The sheets are meant for personal, family, classroom and library use; please do not resell them.

Frequently asked questions

Are the answers included? Yes. The answer key is a separate PDF with the answer to every case and a step-by-step explanation. It is kept apart from the puzzles so nobody sees a solution by accident.

Do I need to sign up? No. Both PDFs download straight from this page. There is no email form and no account.

What age are the puzzles for? They are written for ages 8 to 12. DL-01 to DL-03 are good for younger or newer solvers, and DL-04 and DL-05 are harder. Adults often enjoy the Medium cases too.

Is guessing allowed? There is never any need. Each case has one answer that the clues prove, so a solver who feels stuck should look for the next certain fact rather than pick a name.