Star Sudoku - Six Large Triangles Make New Challenge. Ultimate Logic Puzzle Brain Teaser for People who like Sudoku. Suitable for kids, boys and girls. Easy at start, get difficult on higher levels. Star Sudoku consists of 6 larges triangles. The object is to fill all empty triangles so that each large triangle contains numbers 1 through 9. Every line (of length 9, even uncontinuous) contains every digit. Notice that the row on the outer edge includes the cell on the nearest sharp end of the fi