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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 (590 problems)
Liars and Knights (166 problems)
Weights and Scales (104 problems)
Probability (381 problems)
Shapes (432 problems)
Geometry (514 problems)
General (521 problems)
Tricks (85 problems)
Word Problems (486 problems)
Cryptography (193 problems)
Numbers (1390 problems, 1 new)
Sequences (338 problems)
Games (144 problems)
Paradoxes (34 problems)
Riddles (182 problems)
Famous Riddles (42 problems)
Just Math (1701 problems, 1 new)
Calculus (143 problems)
Science (98 problems)
Algorithms (77 problems)
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