Truth tellers

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Each person always tells the truth or always lies. Nobody changes part way. Each one makes a single statement. A truth teller's statement is true. A liar's statement is false as a whole. If a liar says “A and C both lie”, at least one of them tells the truth. It does not mean both do. Exactly one answer fits every statement.

Select one of four answers, then choose Check. You can change your selection before checking. Read the explanation and continue when ready. Keyboard: Tab to the answers and use the arrow keys to change your choice.

Every round has four people. On Easy, two of them name one other person, one talks about a pair, and one says whether two people match. Standard adds a statement that starts with "if": one round type has a single one, the other has three. Challenge has one statement the rest already settle, and the explanation says which one that was.

Solving time excludes setup, explanations and background tabs. The optional challenge gives you two minutes of solving time across six questions. When time runs out, unanswered questions count as incorrect. Timed and untimed results stay separate.

The browser loads a complete six-question round from the server when you start or restart. Completed rounds and timed-out challenges are saved when browser storage is available; ending early is not saved. Your individual answers are not uploaded.

Aptitude tests use this format, and so do logic puzzle books. This page is practice. It is not any exam and is not connected to one.

A score here says how many of these six questions you answered correctly. It does not measure intelligence and it is not an IQ test or a selection test. Every round uses different questions, so scores move around.

Keyboard: press an answer's letter or number to choose it, Enter to check, and Enter again to continue.