Color Sudoku  (English, Paperback, Riley Philip)

Sudoku fans will welcome this bright new twist to the popular puzzles! Every one of these ingenious creations makes colours and patterns part of the solving fun and although each puzzle maintains the normal 9X9 grid and follows the basic rules of the game, every style adds an additional restriction to intensify the challenge. "Even/Odd" features squares in two colours, depending on whether the number filling it is even or odd. And in "Positional Board," no two of the red squares can be the same number. They're all a challenge and more importantly, lots of fun!