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The DeduceQuest case-room — friendly cartoon kid-detectives cracking a hidden colour code on a deduction board and crossing off a logic grid

DeduceQuest

A wrong guess isn’t a miss — it’s a clue. Narrow a hidden code with Whittle, cross-reference with Tablo, read the grid with Nona, and test a hypothesis with Rulewright. Deducia frames every puzzle as predict → observe → explain.

Crack a case Learn to deduce
Level 1

Most popular

Whittle’s Code Breaker Crack a hidden colour code from feedback pegs — Mastermind & Bulls-and-Cows. Tablo’s Logic Grid Cross off possibilities clue-by-clue until one ✓ is left per row and column. Nona’s Nonogram Fill cells purely from the row and column number clues to reveal a picture. Rulewright’s Guess the Rule Predict the hidden rule before the reveal, then reconcile — predict, observe, explain.
Brain Break Take a quiet moment between cases — a fun logic riddle or a short breather. Brain breaks help you remember what you learn.

All activities

Crack the case

Whittle’s Code Breaker Crack a hidden colour code from exact / colour feedback pegs — Mastermind & Bulls-and-Cows. Tablo’s Logic Grid Cross off possibilities clue-by-clue until one ✓ is left per row and column. Nona’s Nonogram Fill grid cells purely from the row and column number clues to reveal a hidden picture. Rulewright’s Guess the Rule Predict the hidden rule, watch what follows and what breaks, then reconcile. Name the Forcing Clue You solved WHICH — now name WHY. Pick the one clue that forces the next step. The Interrogation Room Knights tell the truth, knaves always lie. From what each islander says, deduce every kind — one world fits.

Learn & practice

Learn to Deduce Start here — how a wrong guess becomes a clue, and how deduction actually works. Mixed Practice A short round across the kits you have played — spaced so it sticks. Sharpen Up Quick recall of kits you have mastered. Self-paced; turn on a timer only if you want one. Deduction Rush A calm speed round — race your own best on what you already know. No penalty for a miss. Trick Questions Brain-teasers with a twist — spot why the obvious answer is a trap. Teach the Cast Teach a deduction move to a cast member still learning it — teaching makes it stick.

Play together

Deduce Duel 2–4 players take turns on one device — same questions, highest first-try score wins. Code Breaker — Pass & Play One player secretly sets a colour code, the other cracks it, then swap. Fewest guesses wins. Deduce Quest — the map A progression trail through every kit — clear each stop of real practice, then move on. Progress Your levels, streak, and how each track is coming along — saved on this device.
Concept Kits — 16 kits of deduction practice

Each kit is a short round of questions with hints when you need them. From reading feedback to logic grids to the scientific method — progress stays on this device.

Kit 1: Reading Feedback Code-Breaking · 4-5 · 25 questions Kit 2: Narrowing the Field Code-Breaking · 4-5 · 25 questions Kit 3: Bulls & Cows Code-Breaking · 4-5 · 25 questions Kit 4: Grid Basics Logic Grids · 4-5 · 25 questions Kit 5: Cross-Referencing Clues Logic Grids · 5-6 · 25 questions Kit 6: Nonogram Runs Nonograms · 5-6 · 25 questions Kit 7: Contradiction & Proof Reasoning · 5-6 · 25 questions Kit 8: Forming a Hypothesis Guess the Rule · 5-6 · 25 questions Kit 9: Testing a Hypothesis Guess the Rule · 6-7 · 25 questions Kit 10: Controlling Variables Reasoning · 6-7 · 25 questions Kit 11: Nonogram Intersections Nonograms · 6-7 · 25 questions Kit 12: Information & Best Guess Scientific Method · 6-7 · 25 questions Kit 13: Probabilistic Reasoning Reasoning · 7-8 · 25 questions Kit 14: Deductive vs Inductive Reasoning · 7-8 · 25 questions Kit 15: Constructing Explanations Reasoning · 7-8 · 25 questions Kit 16: Capstone — the Scientific Method Scientific Method · 7-8 · 25 questions

More ways to play

Deduction Run Trust the Logic Bot? Daily Puzzle

Same idea, another world

Something you practice here shows up somewhere else too — that's real learning that travels.

Cracking a hidden code by ruling out what the clues forbid is the same elimination that names the one suspect the evidence proves. The shared idea: deduction by elimination — cracking a hidden code by ruling out what the feedback forbids is the same elimination that names the culprit from the evidence Try SleuthLab →

Meet the cast — the characters who teach this

Each one stands for an idea you’ll practice. Tap a character to read their illustrated story and hear their audio drama.

Ensemble stories — the cast together

Explore all the stories →

📚 Books for DeduceQuest

Read the story, print a workbook, or color the cast — free PDFs to read offline or print at home.

Browse all books →

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