How many questions are in this quiz?

This quiz has 110 questions focused on consistent statements in truth-teller and liar puzzles.

What is the format of the questions?

Each question is multiple-choice with 4 options, and there is no timer.

Is the difficulty suitable for beginners?

Yes. The difficulty is mixed, so you’ll get both accessible starters and more challenging consistency checks.

How do I choose the number of questions and difficulty?

Use the start panel settings to select your question count and preferred difficulty before beginning.

What’s the most common mistake in these puzzles?

Negating only part of a liar’s statement is a common error; treat the entire statement as false and negate it carefully.

Truth-tellers and liars: consistent statements

About this quiz

What you’ll solve

These puzzles focus on consistency: deciding whether a set of statements can all hold together given truth-tellers (always true) and liars (always false). You’ll practice translating language into logic and checking whether assumptions lead to contradictions.

Every question uses 4 options and there’s no timer, so you can slow down and verify each implication. Before you start, choose your preferred question count and difficulty to match a quick warm-up or a longer mixed challenge.

Skills you’ll practice

Identifying contradictions and “impossible” statement sets
Tracking who must be a truth-teller vs a liar from minimal clues
Handling nested statements like “A says that B lies”
Testing cases systematically without losing track of assumptions
Spotting hidden quantifiers (always/never/at least one/exactly one)

Common pitfalls (and how to avoid them)

Many wrong answers come from flipping only part of a liar’s statement instead of negating the whole claim. Another frequent trap is assuming roles too early—try a case split, push it until it contradicts, then switch.

Difficulty balance

Mixed difficulty means you’ll see straightforward one-step consistency checks alongside denser multi-person scenarios. The progression is balanced so easier items build confidence, while tougher questions reward careful bookkeeping and clean logic.