Sudoku-7B-X Thumbnail of a Sudoku-7B-X puzzle.

Size:
7x7.
Elements:
1, 2, 3, 4, 5, 6, and 7.
Groups: Twenty-three total.
The 7 rows.
The 7 columns.
The 7 septominos.
The 2 diagonals.
Instructions:
Precise details on group numbering.
Answer grids:
There are 372,960 answer grids,
(including all possible symetrically equivalent grids)

Puzzle Difficulty levels and Examples

Difficulty LevelLowHighExample
Easiest 2 2
Easy 3 4 Puzzle   ·   3-steps   ·   All-steps   ·   Solution grid
Medium 5 8 Puzzle   ·   3-steps   ·   All-steps   ·   Solution grid
Difficult 9 12 Puzzle   ·   3-steps   ·   All-steps   ·   Solution grid
Challenging 13 14 Puzzle   ·   3-steps   ·   All-steps   ·   Solution grid