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Below is the list of categories of puzzles and problems available on perplexus.info. 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 (426 problems)
Shapes (479 problems)
Geometry (608 problems)
General (565 problems)
Tricks (88 problems)
Word Problems (591 problems)
Cryptography (202 problems)
Numbers (1777 problems)
Sequences (385 problems, 1 new)
Games (158 problems)
Paradoxes (34 problems)
Riddles (185 problems)
Famous Riddles (45 problems)
Just Math (1941 problems)
Calculus (160 problems)
Science (114 problems)
Algorithms (82 problems)
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