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Samurai Sudoku puzzles consist of five overlapping sudoku grids. Fill in the grids so that every row , every column , and every 3x3 box contains the digits 1 through 9.

ill in the grid so that every row, every column, 2x3 box and both diagonals contain the digits 1 through 6.

Fill in the grid so that every row , every column , and every 3x3 box contains the digits 1 through 9. Frame Sudoku consists of an empty grid. Numbers in the outside frame equal the sum of the first three numbers in the corresponding row or column in the given direction.

Place a digit from 1 to 9 into each of the empty squares so that each digit appears exactly once in each of the rows, columns and the nine outlined 3x3 regions.

If absolute difference between two digits in neighboring cells equals 1, then they are separated by a white dot. If the digit is a half of digit in the neighboring cell, then they are separated by black dot. The dot between 1 and 2 can be either white or black.

If absolute difference between two digits in neighboring cells equals 1, then they are separated by a white dot. If the digit is a half of digit in the neighboring cell, then they are separated by black dot. The dot between 1 and 2 can be either white or black.

Greater Than Sudoku is the variation of the original sudoku.

In addition, greater than or less than signs (">" or "<") in the walls indicate that one cell's number is greater than or less than an adjacent cell's number.

In addition, greater than or less than signs (">" or "<") in the walls indicate that one cell's number is greater than or less than an adjacent cell's number.

Fill in the grid so that every row , every column , and every 2x3 box contains the digits 1 through 6. In Killer Sudoku, sub-regions have specified sums, and no number can be repeated within a region.