Hard Sujiken Puzzles

About Sujiken Puzzles

Sujiken puzzles are a special kind of logic puzzle with triangle-shaped grids instead of the square grids used in Sudoku. The grid is made up of 45 cells arranged in a right triangle, and each cell holds a number from 1 to 9. Just like in Sudoku, you must make sure that no number is repeated in any row, column, or any of the three larger 3x3 triangles.

Basic Rules / How to Play

• Fill the Grid: Fill each empty cell in the triangular grid with a digit from 1 to 9. The numbers used depend on the size of the grid. For example: A Sujiken puzzle with 6 rows might use the numbers 1 through 6.
• No Repetition in Rows: No digit can appear more than once in any row of the grid.
• No Repetition in Columns: No digit can appear more than once in any column of the grid.
• No Repetition in Diagonals: No digit can appear more than once along any diagonal line within the grid.
• No Repetition in Regions: The grid is divided into three triangular regions by bold lines. No digit can appear more than once within any of these regions.

Solving Tips and Techniques:

• Start with Clues: Use the given numbers to rule out options for nearby cells in the same row, diagonal, or group.
• Cross-Elimination: Check where rows, diagonals, and regions overlap. If you place a number in one spot, it cannot go in the same row, diagonal, or overlapping region.
• Triangular Regions: Look at the smaller triangle areas. If a triangle is missing just one number, you can usually figure it out right away.
• Diagonals: Focus on diagonal rules, as they are trickier than row or region rules. Use the given clues to figure out possible spots along crossing diagonals.
• Guessing (Trial and Error): If you get stuck, you might need to make an educated guess and then backtrack if it leads to a contradiction.

Sujiken puzzles are great for boosting your logic and spotting patterns, making them a fun and rewarding activity!