“Pure mathematics is, in its way, the poetry of logical ideas. -- Albert Einstein”
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I enjoy working on math brain teasers in my spare time. See my collection of brain teaser websites below.
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Using your Head is Permitted (Difficulty ★★★★★, Interestingness ★★★★☆)
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IBM Ponder This (Difficulty ★★★★☆, Interestingness ★★★★)
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The Puzzle Toad (Difficulty ★★★☆, Interestingness ★★★☆)
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Math Puzzles Collected by Haidong Wang (Difficulty ★★★★, Interestingness ★★★☆)
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Mathoverflow So many great Mathematians.
Matrix67 (Chinese) (Difficulty ★★★★☆, Interestingness ★★★★☆)