Sujiken – Medium

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Sujiken is a variant of the widely recognized puzzle, Sudoku, and was invented by George Heineman from the USA. Unlike the traditional Sudoku, which is played on a square grid, Sujiken is played on a triangular grid composed of square cells. The objective remains to fill the grid in such a way that each digit from 1 to 9 is used without repetition in specified areas.

Basic Rules

1. Digits from 1 to 9: The player must fill in each cell with digits from 1 to 9.
2. No Repetition in Rows and Columns: No digit may be repeated in any row or column throughout the grid.
3. No Repetition in Sub-Areas: Similarly, no digit can be repeated in any of the defined sub-areas within the grid.

Additional Rules

• Triangular Grid: Unlike Sudoku, the grid is triangular, which may alter the arrangement and shape of sub-areas and the alignment of rows and columns.

Basic Solving Tips

1. Start with the Known: Begin by filling in cells with definite answers to create clues for the other cells.
2. Look for Clues: Identify rows, columns, or sub-areas where most numbers are already filled in to easily find what's missing.
3. Use Elimination: Determine what numbers cannot be in a cell to narrow down the possibilities for what can be.
4. Check for Consistency: Regularly check that the existing filled numbers still adhere to the basic rules as you progress.
5. Use Pencil Marks: Make small notes in a cell of possible numbers, and update them as you gather more information.