How to Play
- Read all the statements on the cards.
- Hold the rule set in mind: one guilty (lies), the rest innocent (truthful).
- Hypothesize each suspect as guilty and check whether everyone's statement stays consistent.
- The single suspect that survives the check is your culprit — accuse them.
Solving Tips
- Look for contradictory pairs. If two statements can't both be true, one of those two might be your liar.
- Anchor on self-claims. "I'm innocent" is true if they're innocent and false if guilty — a clean lever.
- Chain the consequences. Assume a culprit, mark each statement true/false, and see if anything breaks.
- Use the Hint. The first press glows the cards that mention the culprit; the second narrows it down.
What's new
- Jun 18, 2026 — Built the unique-solution puzzle generator and an automated daily-update pipeline. The bank is now machine-generated and verified, with each weekday mapped to its own difficulty tier (Mon easiest → Sun hardest), plus dated answer pages and an answers archive published every day.
- Jun 17, 2026 — Added streak & stats tracking, a share-result card, a two-level Hint, and a weekday difficulty ladder. Every puzzle is verified to have exactly one logical solution.
- Jun 16, 2026 — Added the Today's Answer page with full step-by-step reasoning.
- Jun 15, 2026 — Launched the daily logic deduction game and How to Play tutorial.
Clarifying details
- Guilty / innocent — every suspect is exactly one of the two; there is exactly one guilty suspect.
- "I'm innocent" / "I didn't do it" — true when the speaker is innocent, false when the speaker is guilty.
- "X did it" — true only if X is the guilty one.
- "X is innocent" — true unless X is the guilty one.
- "Either A or B did it" — true if the guilty one is A or B (inclusive).
- "Y is telling the truth" — true exactly when Y's own statement is true.
Stuck?
Don't feel bad — deduction takes practice. Reveal the full worked reasoning on the today's answer page, or read the how to play tutorial. Every puzzle is provably solvable by logic alone, so there's always a next step you can justify.
Share your result
When you solve, the result card shows your time and a symbol: 🟩 a clean solve, 🟨 you made at least one mistake, 🟡 one hint used, 🟠 two hints used — plus your current streak. Tap Share result to copy or share it.
More puzzles
Come back daily for a new case, or switch to Unlimited for back-to-back puzzles. Have feedback or a logic-error report? See contact.
FAQ
Is every puzzle solvable by logic alone?
Yes. Each puzzle is verified at load time to have exactly one consistent culprit — you never need to guess. If a puzzle ever failed that check, a banner would warn you at the top.
Is it free?
Completely free, no account required. The site is supported by ads (see our privacy policy).
Where's today's solution?
On the today's answer page, with the full reasoning.