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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 (576 problems)
Liars and Knights (164 problems)
Weights and Scales (98 problems)
Probability (365 problems)
Shapes (387 problems, 3 new)
Geometry (497 problems)
General (510 problems)
Tricks (81 problems)
Word Problems (452 problems)
Cryptography (190 problems)
Numbers (1343 problems)
Sequences (320 problems)
Games (142 problems)
Paradoxes (34 problems)
Riddles (181 problems)
Famous Riddles (39 problems)
Just Math (1601 problems, 1 new)
Calculus (139 problems)
Science (97 problems)
Algorithms (72 problems)
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