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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 (644 problems)
Liars and Knights (174 problems)
Weights and Scales (111 problems)
Probability (438 problems, 1 new)
Shapes (487 problems)
Geometry (630 problems)
General (572 problems)
Tricks (90 problems)
Word Problems (613 problems)
Cryptography (203 problems)
Numbers (1847 problems, 1 new)
Sequences (393 problems)
Games (160 problems)
Paradoxes (34 problems)
Riddles (185 problems)
Famous Riddles (45 problems)
Just Math (2002 problems)
Calculus (166 problems, 1 new)
Science (114 problems)
Algorithms (83 problems)
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