Study guides › Level 10 · Grandmaster

Harder truth-tellers

Level 10 · truth-teller puzzles about counts (“Exactly two of us…”)

💡 The idea

Some sentences talk about the whole group. Count carefully, including the speaker.

🪜 The steps

1. List every mix of honest and fibbing (with 3 people there are 8).
2. Cross out mixes where any sentence doesn’t match its speaker.
3. One mix is left.

⚠️ Watch out

• A fibber’s “Exactly one of us tells the truth” means the number is not one: it could be none, two or three.

🎯 Try these

1. A says: “Exactly one of us two tells the truth.” B says: “A fibs.” Who tells the truth?

Answers: 1) Only A

This guide is also in the 10LogicQ app: tap “📖 Study guide” after a puzzle.