KILLER SUDOKU puzzles have much in common with standard SUDOKU puzzles. They are solved by placing numbers into the puzzles in such a way that every row, column and 3X3 box contains each of the numbers 1 thru 9. However, there are no prefilled cells in the puzzle to get you started. Instead, the cells of the puzzle are collected into groups called cages having random shapes and sizes. Each cage includes a one or two digit score which is the sum of all the solution digits for the cells within the cage. Many innovative techniques are available to use this information to complete the solution. The following graphic shows a KILLER SUDOKU puzzle as it appears in the Crossword Express build screen. The cages are defined by the broken green outlines, and the cage scores appear in the top left corner of the cages.
The key features of the KILLER SUDOKU function of Crossword Express are as follows:-