In **Star Sudoku** the row on the outer edge of the grid includes the cell on the nearest sharp end of the figure.

**Tridoku** was invented by Japheth Light (USA). The puzzle consists of nine large triangles; the numbers 1 through 9 must be placed into the triangular cells of each large triangle. Also, the numbers 1 through 9 must be placed in the three legs of the inner shaded triangle and in the three legs of the outer shaded triangle. No two neighboring cells may contain the same number.

The formats of sudoku files:

**HOSHI**- Hoshi;**TRD**- Tridoku.