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LEV
PUZZLE
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**Sujikai**, also known as **Sujiken**, is
a variation of Sudoku, invented by George Heineman (USA).
This puzzle is constructed from 45 cells placed in a triangle. Some cells already contain a digit from 1 to 9. You must place a digit in each of the remaining empty cells and find the unique solution following 4 simple rules:

- No digit occurs twice in any horizontal row.
- No digit occurs twice in any vertical column.
- No digit occurs twice in any diagonal.
- No digit occurs twice in any of the three 3x3 square or 3 triangular regions.

Follow the steps below to solve a Sujikai puzzle from our database.

- LEV: choose your starting level (1=easy - 3=hard).
- PUZZLE: enter the number of the Sujiken puzzle you want to solve.
- START: this Sujikai puzzle is now loaded and the box at the bottom right turns yellow.
- Click on ⏭ to go to the next puzzle.
- Choose a box where you want to enter a number. This box will then turn yellow.
- Choose one of the 9 big numbers if you are sure of your choice
- Choose one or more of the 9 smaller numbers to indicate possible candidates
- If you select a number when the box already has a number, then this new number will replace the previous number.
- You can make a box empty by clicking on the number that is already in the box.
- Click on ✓ to check the Sujikai puzzle. The wrong boxes turn red. If the puzzle is completely correct, all boxes will turn yellow.
- Click on SOL to show the solution of the Sujiken puzzle.