Sudoku types for month December 2012

There will be 4 Classic Sudokus in Round1.
The variations in Round2 in this month are UnTouch Sudoku, Outside Sudoku, Killer Sudoku, No Knight Step Sudoku,
Rules and examples are provided below.

Author

Sudokus for December 2012 are written By Tom Collyer (detuned)

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

UnTouch Sudoku

Apply Classic Sudoku rules.
Identical digits do not touch each other diagonally.

Outside Sudoku

Apply Classic Sudoku rules.
The digits outside the grid must appear in one of the first three cells encountered from that edge of the grid.

Killer Sudoku

Apply Classic Sudoku rules.
The sum of digits in cells inside every cage must equal the total given for the cage at the upper left cell. Each digit in the cage must be unique.

No Knight Step Sudoku

Apply Classic Sudoku rules.
No cell that is a knight-step away can contain the same digit.

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