Sudoku types for month October 2012

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

Author

Sudokus for October 2012 are written By 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

Toroidal Sudoku

Every digit from 1 through 7 has to appear exactly once in every row, every column, and outlined regions.
Some of the outlined regions will wrap between the top and bottom edges, and/or the left and right edges of the grid.

Odd Sudoku

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

Consecutive Sudoku

Apply Classic Sudoku rules.
Neighbouring cells which contain consecutive digits are marked by dots. All possible dots are marked.

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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