Hard Sudoku: May 16, 2025. Solve the grid in this hard Sudoku puzzle! The objective of Sudoku is to fill each row, column and sub-grid with exactly one of each number from 1-9.

As a relative newcomer to The Post’s daily Sudoku puzzles, I can usually do the Monday through Wednesday puzzles, rated at one through three stars in difficulty. Thursday, a “four,” is iffy ...

Jun 16, 2006. The empire of Sudoku. It's has been a year since the puzzle game started to appear in US papers, and it's pretty much created its own business empire since.