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    • Sudoku Hard | Daily Echo

      Daily Echo· 3 days ago

      Play Sudoku Hards from Daily Echo online right now. New puzzles available every day.

    • The Rubik’s Cube Turns 50

      The Rubik’s Cube Turns 50

      New York Times· 5 hours ago

      A big math conference was underway and Dr. Rokicki, a retired programmer based in Palo Alto, Calif., had helped organize a two-day special session about...