Sudoku types for month August 2013

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

Author

Sudokus for August 2013 are written By Jan Mrozowski (janoslaw)

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.

Odd Even Sudoku

Apply Classic Sudoku rules.
All shaded cells must contain even digits. All white cells must contain odd digits.

Apply Classic Sudoku rules.
Some cells will have circles inside and some others will have squares. Cells with circles must contain the digits 1, 2 and 3. Cells with squares must contain the 4, 5 and 6. Blank cells must contain the digits 7, 8 and 9.

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