Sudoku-4-EFGH

Size:

4x4.

Elements:

E, F, G, and H.

Groups: Twelve total.

The 4 rows.

The 4 columns.

The 4 2x2 squares.

Instructions:

Precise details on group numbering.

Answer grids:

There are 288 answer grids,

(including all possible symetrically equivalent grids)

Puzzle Difficulty levels and Examples

Difficulty Level	Low	High	Example
Easiest	2	2	Puzzle   ·   3-steps   ·   All-steps   ·   Solution grid
Easy	3	3	Puzzle   ·   3-steps   ·   All-steps   ·   Solution grid