If the correct keyword is included in the email, the user will receive a reply with the code to enter into the box. Another puzzle requires the user to call a particular phone number and listen ...

Get started solving the classic number puzzle with tips from some of the best ... But first, the basics: A classic Sudoku has nine boxes, each subdivided into nine cells, for a total of 81.

Which number must be inserted in place of the incorrect number? Show puzzle solution The number 75 must be replaced by the number 74. The numbers in the table, ordered by size, are each the ...