HyperSudoku-8up

Size:

8x8.

Elements:

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

Groups: Twenty-six total.

The 8 rows.

The 8 columns.

The 8 2x4 rectangles.

The 2 4x2 inner rectangles.

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	12	Puzzle   ·   3-steps   ·   All-steps   ·   Solution grid
Challenging	13	16