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Below is the list of categories of puzzles and problems available on If you think we are missing a category, feel free to let us know. Or just submit a problem, and if it fits none of the categories shown, we will be forced to add a new one just for you! Finally, if you're not sure which category to go to, just jump to a random problem.
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Logic (608 problems)
Liars and Knights (169 problems)
Weights and Scales (107 problems)
Probability (404 problems)
Shapes (442 problems)
Geometry (545 problems)
General (540 problems)
Tricks (87 problems)
Word Problems (520 problems)
Cryptography (197 problems, 1 new)
Numbers (1535 problems, 2 new)
Sequences (354 problems)
Games (153 problems)
Paradoxes (34 problems)
Riddles (184 problems)
Famous Riddles (45 problems)
Just Math (1759 problems)
Calculus (143 problems)
Science (98 problems)
Algorithms (81 problems)
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