## KSudoku Variations

• The Standard 9x9 Sudoku puzzle has 9 rows, 9 columns and 9 square blocks of size 3x3.

• Other sizes of Standard Sudoku are 4x4 (very easy), 16x16 and 25x25 (not so easy).

• The Jigsaw variation is the same as Standard Sudoku except that some blocks are not square.

• The XSudoku variation is exactly the same as Standard Sudoku with an additional requirement: the two main diagonals must also each contain the symbols 1 to 9 once and once only. KSudoku highlights the diagonals to make this easier to see.

• The Roxdoku variations are based on cubes in three dimensions, but are easier than they sound. There are no rows or columns. A 3x3x3 Roxdoku puzzle has 27 small cubes arranged into a larger 3x3x3 cube. This contains nine slices, each containing 3x3 small cubes, and these are the square blocks that must be filled with the numbers 1 to 9. A 4x4x4 Roxdoku has twelve 4x4 slices and a 5x5x5 Roxdoku has fifteen 5x5 slices.

• The Samurai Sudoku consists of five Standard Sudoku puzzles of 9x9 squares each, overlapping at the corners by four 3x3 blocks. Each of the five puzzles has 9 rows and 9 columns to solve, but there are only 41 blocks to solve, rather than 45, because of the overlap.

• The Tiny Samurai Sudoku consists of five 4x4 puzzles, overlapping at the corners by four squares. Each of the five puzzles has 4 rows, 4 columns and 4 blocks to solve.