Puzzles
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The competitive world of sudoku is thriving in India – on WhatsApp
Vinita Govindarajan
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Watch this 23-year-old from Korea solve a Rubik’s cube in a record time of 4.5 seconds
Scroll Staff
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What it takes to become a cryptic crossword expert – and it’s more than just practice
Kathryn Friedlander and Philip A. Fine, The Conversation