Sudoku types for month December 2013

There will be 4 Classic Sudokus in Round1.
The variations in Round2 in this month are Diagonal Sudoku, Irregular Sudoku, Arrow Sudoku, Inequality Sudoku,
Rules and examples are provided below.

Author

Sudokus for December 2013 are written By Bastien Vial-Jaime (OursBrun)

Classic Sudoku

Place the digits 1 through 9 into the empty cells in the grid so that each digit appears exactly once in each of the rows, columns, and bold outlined 3X3 boxes.

Answer key for the above Sudoku is : 416978325, 327186459

Diagonal Sudoku

Place the digits 1 through 9 into the empty cells in the grid so that each digit appears exactly once in each of the rows, columns, bold outlined 3X3 boxes, and every diagonal marked by lines.

Irregular Sudoku

Every digit from 1 through 7 has to appear exactly once in every row, every column, and outlined regions. Each outlined region has 7 cells and is marked by thick borders.

Arrow Sudoku

Apply Classic Sudoku rules.
The sum of the digits along the path of each arrow must equal the digit in the circled cell. Digits can repeat within an arrow shape.

Inequality Sudoku

Apply Classic Sudoku rules.
“<” and “>” arrows point to the smaller number of each pair.

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