The father of sudoku makes Masyu
I solved a lot of Sudoku puzzles this winter when I went to Norway during my Christmas vacation. When it is cold and dark it is little else to do than play and eat… I am glad to see that Maki Kaji, the father of Sudoku, has invented Masyu so I don't get too fat next Christmas :-)
The rules are simple but I don't think it will have the universal appeal of Sudoku as most people will find it more difficult:
- Make a single loop with lines passing through the centers of cells, horizontally or vertically. The loop never crosses itself, branches off, or goes through the same cell twice.
- Lines must pass through all cells with black and white circles.
- Lines passing through white circles must pass straight through its cell, and make a right-angled turn in the cell next to the white circle (left or right).
- Lines passing through black circles must make a right-angled turn in its cell, then it must go straight through the next cell (till the middle of the second cell) on both sides.