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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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Home (Top Level)
Logic (611 problems)
Liars and Knights (169 problems)
Weights and Scales (107 problems)
Probability (410 problems)
Shapes (445 problems, 1 new)
Geometry (561 problems)
General (550 problems)
Tricks (88 problems)
Word Problems (530 problems)
Cryptography (198 problems)
Numbers (1604 problems, 1 new)
Sequences (363 problems)
Games (154 problems)
Paradoxes (34 problems)
Riddles (184 problems)
Famous Riddles (45 problems)
Just Math (1792 problems)
Calculus (146 problems, 1 new)
Science (104 problems)
Algorithms (81 problems)
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