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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 (602 problems)
Liars and Knights (168 problems)
Weights and Scales (107 problems)
Probability (396 problems)
Shapes (438 problems)
Geometry (526 problems)
General (529 problems, 1 new)
Tricks (85 problems)
Word Problems (498 problems, 1 new)
Cryptography (193 problems)
Numbers (1438 problems)
Sequences (344 problems)
Games (149 problems)
Paradoxes (34 problems)
Riddles (182 problems)
Famous Riddles (42 problems)
Just Math (1714 problems)
Calculus (143 problems)
Science (98 problems)
Algorithms (78 problems)
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