PlaySudoku.us
Expert · Puzzle #655
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7
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9
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5
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9
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The brain releases dopamine when it solves a puzzle — the same reward chemical triggered by food and exercise.
The brain releases dopamine when it solves a puzzle — the same reward chemical triggered by food and exercise.
"Life is really simple, but we insist on making it complicated." — Confucius
"Life is really simple, but we insist on making it complicated." — Confucius