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.

Sudoku — Games & Puzzles — Knight Features

Colored Sudoku Set - Logic Game for Kids and Adult – Kubiya Games

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

🕹️ Play Free Online Pixel Art Games: Nostalgic 8-Bit Inspired Retro Arcade Games

Anti-Knight Killer Sudoku — Rätselportal — Logic Masters Deutschland

Colour Killer X Sudoku — Knight Features

Killer Sudoku - Puzzle Games • Game Solver

Puzzle Maker Pro - More Clues Add-On for Sudoku Other Grid Sizes

Killer Sudoku Rules - How to play Killer Sudoku