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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 (636 problems)
Liars and Knights (173 problems)
Weights and Scales (111 problems)
Probability (428 problems)
Shapes (479 problems)
Geometry (610 problems)
General (567 problems, 1 new)
Tricks (88 problems)
Word Problems (593 problems)
Cryptography (202 problems)
Numbers (1780 problems)
Sequences (385 problems)
Games (158 problems)
Paradoxes (34 problems)
Riddles (185 problems)
Famous Riddles (45 problems)
Just Math (1944 problems)
Calculus (161 problems)
Science (114 problems)
Algorithms (82 problems)
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