In the realm of logic, it doesn't matter what you believe -- it only matters what you can prove. A detective uses his magnifying glass to hunt for clues, and follows those leads to determine who did it. In a similar manner, logic problems test your deductive reasoning ability. Sharpen your deduction skills with a variety of puzzles, ranging from basic reasoning up to some serious mind-benders.
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.
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.
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.
Arithmetic puzzles are Mad Libs for math: fill in the blanks with numbers or operations to make the equation true.
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.
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.
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.
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.
See the confluence of probability and logic by exploring these mind-bending 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.
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!
If you’re reading this sentence, then propositional logic is meant for you. It's time to demystify the art of formal logic!
Syllogisms are the original logic, going back to Aristotle. They still find prominence today in the form of Venn and Euler Diagrams.