**Sujiken** (from Japanese "sujikai", literally "*diagonal*") is a variation of Sudoku, invented by George Heineman (USA). The puzzle consists of a triangular grid of cells containing digits from 1 to 9. The objective is to fill a grid with digits so that each cell contains a digit and no digit is repeated in any column, row and diagonal in any direction. Also, no digit occurs twice in any of the three larger ** 3 x 3** square regions and any of the three larger triangular regions enclosed by thick borders.

Task files have the extension *.**SUJI**.