Sudoku types for month September 2012

There will be 4 Classic Sudokus in Round1.
The variations in Round2 in this month are Irregular Sudoku, Odd Sudoku, NonConsecutive Sudoku, Extra Region Sudoku,
Rules and examples are provided below.

Author

Sudokus for September 2012 are written By TTHsieh, Lin Minfang, Deb Mohanty

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

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.

Odd Sudoku

Apply Classic Sudoku rules.
All shaded cells must contain odd digits. There is no restriction on white cells.

NonConsecutive Sudoku

Apply Classic Sudoku rules.
Horizontally or vertically adjacent cells cannot contain consecutive digits.

Extra Region Sudoku

Apply Classic Sudoku rules.
Each extra region must contain digits from 1-9. The extra regions are of 9 cells each and are shaded with different colors in the grid.

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