Image provided by: qlfecvqlfecv has released an massive improved version of Sudoku for the PSP. Sudoku is a puzzle game where the aim of the puzzle is to enter a numeral from 1 through 9 in each cell of a grid, most frequently a 9? grid made up of 3? subgrids (called”regions”), starting with various numerals given in some cells (the”givens”). Each row, column and region must contain only one instance of each numeral.