Sudoku types for month February 2013

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

Author

Sudokus for February 2013 are written By Prasanna Seshadri, 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.

XV Sudoku

Apply Classic Sudoku rules.
All adjacent cells with two digits summing to 5 are marked by V, while those summing to 10 are marked by X. All possible X and V are marked.

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.

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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