Practice
Logic
Courses
Take a guided, problem-solving based approach to learning Logic. These compilations provide unique perspectives and applications you won't find anywhere else.
Logic
What's inside
- Introduction
- The Rational Detective
- Puzzles and Riddles
- Multi-Level Thinking
- Competitive Games
- Logic Machines
- Advanced Knights and Knaves
Logic II
What's inside
- Introduction
- Syllogisms and Sets
- Propositional Logic
- First-Order Logic
Joy of Problem Solving
What's inside
- Intro to Problem Solving
- Truth Tellers and Liars
- Operator Searches
- Coin Rearrangements
- Matchstick Puzzles
Additional Practice
Sharpen your skills with these quizzes designed to check your understanding of the fundamentals.
Puzzles
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Logic Warmups
Sharpen your deduction skills with a variety of puzzles, ranging from basic reasoning up to some serious mind-benders.
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Truth-Tellers and Liars
Time to play detective! Every puzzle in this collection contains a set of statements, but it's up to you to figure out which of those statements are true and which of them are false.
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Cryptograms
Cryptograms are puzzles where some (or all) digits are missing from an arithmetic operation. Tinker with different combinations of numbers and letters to unlock the right answer.
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Logical Reasoning
How can you find a fake coin with a balance scale? How can you use math to pretend to read minds? Solve these puzzles and build your foundational logical reasoning skills.
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Operator Search
Fill in the missing operations to make a true equation.
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Arithmetic Puzzles
Arithmetic puzzles are Mad Libs for math: fill in the blanks with numbers or operations to make the equation true.
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Grid Puzzles
Logic puzzles can get complicated, and keeping track of information while you're sleuthing is no easy task. See how grids can help you efficiently deduce your way to the truth.
Games
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Deterministic Games
Whether you’re just playing around or a master of games, see how mathematical and logical ideas can be combined to analyze games from tic-tac-toe to Nim.
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Chess
Chess is no joke: it has more possible sequences of moves than the number of atoms in the observable universe, but working through chess puzzles is a great way to gain insightful strategies.
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Game Theory
Why do prisoners turn on each other? How can adding an extra road make traffic even worse? Game theory provides a logical framework for answering these questions and understanding human decisions.
Paradoxes
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Paradoxes in Probability
See the confluence of probability and logic by exploring these mind-bending paradoxes.
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Infinitesimal Paradoxes
If you walk halfway across a room, and then halfway across the rest, and halfway across the rest, and so on...will you ever get there? See how weird it gets when things get very, very small.
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Math of Voting
Just count the votes and see who has the most, right? Voting systems can actually be quite complex, and the puzzling mathematical paradoxes that arise from them may surprise you!
Propositional Logic
Community Wiki
Browse through thousands of Logic wikis written by our community of experts.
Puzzles
Games
- Combinatorial Games - Definition
- Combinatorial Games - Winning Positions
- Tic Tac Toe
- Nim
- Sprague Grundy Theorem
- Set (game)
- Chess Puzzles - Reduced Games
- Chess Puzzles - Opening Strategies
- Chess Puzzles - Rook Strategies
- Rook Polynomial
- Game Theory
- Nash Equilibrium
- Zero-Sum Games
- Prisoner's Dilemma
- Braess' Paradox
- Minimax
- Utility Functions
- Risk
- Cognitive Bias