Sudoku types for month March 2013

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

Author

Sudokus for March 2013 are written By Branko Ceranic, 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

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.

Renban Sudoku

Apply Classic Sudoku rules.
Digits on each line must contain distinct consecutive digits.

Odd Sudoku

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

Frame Sudoku

Apply Classic Sudoku rules.
Numbers outside the grid equal the sum of the first three digits in the row or column in the corresponding direction.

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