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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 (629 problems)
Liars and Knights (173 problems)
Weights and Scales (111 problems, 1 new)
Probability (426 problems)
Shapes (475 problems)
Geometry (604 problems)
General (562 problems)
Tricks (88 problems)
Word Problems (583 problems)
Cryptography (200 problems)
Numbers (1768 problems, 1 new)
Sequences (383 problems)
Games (157 problems)
Paradoxes (34 problems)
Riddles (185 problems)
Famous Riddles (45 problems)
Just Math (1933 problems)
Calculus (159 problems)
Science (113 problems)
Algorithms (82 problems)
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