400 Tridoku Sudoku Puzzles: Medium to Hard Triangular Sudoku Puzzles (Tridoku Puzzles) - Softcover

Mindful Puzzle Books

 
9781726459105: 400 Tridoku Sudoku Puzzles: Medium to Hard Triangular Sudoku Puzzles (Tridoku Puzzles)

Synopsis

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.

"synopsis" may belong to another edition of this title.