Sudoku-Cornered

Size:

9x9.

Elements:

1, 2, 3, 4, 5, 6, 7, 8, and 9.

Groups: Thirty-one total.

The 9 rows.

The 9 columns.

The 9 3x3 squares.

The top left corners of each 3x3 square.

The top right corners of each 3x3 square.

The bottom left corners of each 3x3 square.

The bottom right corners of each 3x3 square.

Instructions:

Precise details on group numbering.

Answer grids:

Puzzle Difficulty levels and Examples

Difficulty Level	Low	High	Example
Easiest	2	2	Puzzle   ·   3-steps   ·   All-steps   ·   Solution grid
Easy	3	4	Puzzle   ·   3-steps   ·   All-steps   ·   Solution grid
Medium	5	8	Puzzle   ·   3-steps   ·   All-steps   ·   Solution grid
Difficult	9	14	Puzzle   ·   3-steps   ·   All-steps   ·   Solution grid
Challenging	15	20
Tournament	21	29