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Logic puzzles

A collection of puzzles and brainteasers to challenge your logical thinking skills. Beware: While some of these puzzles are straightforward, but many of them are “mind illusions” - in other words, they have counterintuitive solutions!
What are Mind Illusions?

We’re all familiar with optical illusions. These are images that demonstrate that our eyes can fool us. Traditionally called veridical paradoxes, mind illusions are puzzles or brainteasers that demonstrate that our minds can fool us.

Our intuition is excellent at making fast judgments, but not always for making correct ones. When we make judgments quickly, we can get things wrong. When we have the luxury of time, it is worth thinking about things slowly and carefully before making decisions or drawing conclusions.

Just like we might need a ruler or some other tool to make correct judgments when faced with an optical illusion, we need slow, careful thought to make correct judgments when faced with mind illusions.

The first puzzles are the easiest ones for most people, but even adults frequently get even these ones wrong.


Courses

Fallacy Detectors Part 1

Fallacy Detectors Part 1

Develop the skills to tackle logical fallacies through a series of 10 science-fiction videos with activities. Recommended for ages 8 and up.

US$15

A Statistical Odyssey

A Statistical Odyssey

Learn about common mistakes in data analysis with an interactive space adventure. Recommended for ages 12 and up.

US$10

Symbolic Logic for Teens Part 1

Symbolic Logic for Teens Part 1

Learn how to make sense of complicated arguments with 14 video lessons and activities. Recommended for ages 13 and up.

US$15

Emotional Intelligence

Emotional Intelligence

Learn to recognize, understand, and manage your emotions. Designed by child psychologist Ronald Crouch, Ph.D. Recommended for ages 5 and up.

US$15

Worksheets

Symbolic Logic Worksheets

Symbolic Logic Worksheets

Worksheets covering the basics of symbolic logic for children ages 12 and up.

US$5

Elementary School Worksheets and Lesson Plans

Elementary School Worksheets and Lesson Plans

These lesson plans and worksheets teach students in grades 2-5 about superstitions, different perspectives, facts and opinions, the false dilemma fallacy, and probability.

US$10

Middle School Worksheets and Lesson Plans

Middle School Worksheets and Lesson Plans

These lesson plans and worksheets teach students in grades 5-8 about false memories, confirmation bias, Occam's razor, the strawman fallacy, and pareidolia.

US$10

High School Worksheets and Lesson Plans

High School Worksheets and Lesson Plans

These lesson plans and worksheets teach students in grades 8-12 about critical thinking, the appeal to nature fallacy, correlation versus causation, the placebo effect, and weasel words.

US$10

Statistical Shenanigans Worksheets and Lesson Plans

Statistical Shenanigans Worksheets and Lesson Plans

These lesson plans and worksheets teach students in grades 9 and up the statistical principles they need to analyze data rationally.

US$10