Colour Killer X Sudoku — Knight Features

The normal rules of Killer Sudoku apply. In addition, both main diagonals (marked) and all cells of the same colour must also contain all the digits from 1-9.

Issue 30 - University of Surrey's Student Union

Anti-Knight Sudoku: Rules and Puzzle Book

Chess Sudoku - Apps on Google Play

Killer Sudoku - Puzzle Games • Game Solver

005_Sudoku Style Puzzles — Knight Features

Gotham Knights: How To Solve The Sudoku Puzzle

Chess Sudoku on the App Store

Nonogram - picture cross game - Apps on Google Play

Chess Sudoku – Apps on Google Play

Anti-knight sudoku : Sudoku variants

Logic Wiz released today a new version : r/sudoku

word sudoku PuzzleNation.com Blog

Killer Sudoku Rules - How to play Killer Sudoku