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Perplexus
A forum and collection of brain teasers, logic problems, math problems, paradoxes, science games, probability, riddles, and geometric shapes. The puzzles are searchable and categorized, most have solutions.

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1 logic puzzles 2 26
2 brain teasers 2 123
3 riddles about polar bears 1 3
4 math puzzles 1 13
5 math problems 1 34
6 maximum value 1 1
7 brain teasers and math 1 1
8 just math 1 1
9 riddles 1 229