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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 (625 problems)
Liars and Knights (171 problems)
Weights and Scales (109 problems)
Probability (419 problems)
Shapes (461 problems)
Geometry (594 problems)
General (557 problems)
Tricks (88 problems)
Word Problems (563 problems)
Cryptography (199 problems)
Numbers (1725 problems, 4 new)
Sequences (381 problems)
Games (157 problems)
Paradoxes (34 problems)
Riddles (185 problems)
Famous Riddles (45 problems)
Just Math (1883 problems)
Calculus (155 problems)
Science (111 problems)
Algorithms (81 problems)
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