SujikenTM is a new puzzle based on the wildly popular Sudoku puzzle. A SujikenTM puzzle is constructed from 45 cells placed in a right-triangle as shown below. Some cells already contain a digit from 1 to 9. You must place a digit in each of the remaining empty cells to determine the unique solution that obeys three simple rules:
  1. No digit occurs twice in any horizontal row, vertical column or diagonal.
  2. No digit occurs twice in any of the three larger 3x3 square regions enclosed by thick borders.
  3. No digit occurs twice in any of the three larger triangular regions enclosed by thick borders.

Now that you have to pay attention to the diagonal, everything is different.

We often refer to the three 3x3 square regions (the middle-left square, lower-left square, and lower square) and the three triangular regions (the upper-left triangle, middle triangle, and lower-right triangle). In the sample puzzle here, you can see that the lower-left square is completely empty. Take a look at the middle triangle which is partially completed with four digits placed. What are the other two digits that will be placed within this middle triangle? You cannot use simple elimination because there will only be six digits placed within this triangle.

In explaining how to solve a SujikenTM puzzle we label the nine vertical Columns A to I from left to right. There are nine horizontal Rows labeled 1 to 9 from bottom to top. Each cell is uniquely identified by a column and row; in this sample puzzle, cell B4 contains the digit 9.

A step-by-step solution of this puzzle is available (pop-up slideshow or single page) to show how to solve a SujikenTM puzzle.

 

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