Irregular Killer Sudoku — Knight Features

The normal rules of Killer Sudoku apply, except, the usual 3x3 blocks have been replaced by irregularly shaped, coloured blocks (which must contain all the digits from 1-9).

Indian qualifiers still open for Sudoku & Puzzle World Championships

X-Factor Killer Sudoku — Knight Features

Para's Puzzle Site: March 2013

X-Factor Killer Sudoku — Knight Features

March Hidato Puzzle Answers – Third Point of Singularity

What is Killer Sudoku? How to Play Killer Sudoku - Mastering Sudoku

Daily Killer Sudoku

Irregular Killer Sudoku — Knight Features

Logic Wiz Sudoku free App - Classic, Jigsaw, Killer, Arrow, Kropki, Thermo, Chess Sudoku and many more variations. A celebration for the mind and logic

Colour Killer X Sudoku — Knight Features

Killer Sudoku Cheat Sheet - Puzzle Genius

How to Solve Anti-Knight Sudoku Puzzles