Knights & Knaves

Logic puzzles

An interactive lesson with 6 steps, about 5 minutes: you predict, drag and solve, with instant feedback on every answer. It runs in your browser and needs JavaScript.

What you’ll learn

• Assume a case, follow the consequences, and reject cases that lead to contradictions.
• Check every case systematically: hunches can be wrong.
• Double negatives (a lie about a lie) cancel out.

Steps

1. The island
2. I am a knave
3. Two islanders
4. Same kind
5. Test every case
6. The fork in the road