Sudoku-4-OC Thumbnail of a Sudoku-4-OC puzzle.

Size:
4x4.
Elements:
1, 2, 3, and 4.
Groups: Thirteen total.
The 4 rows.
The 4 columns.
The 4 2x2 squares.
The outside corners.
Instructions:
Precise details on group numbering.
Answer grids:
There are 168 answer grids,
(including all possible symetrically equivalent grids)

Puzzle Difficulty levels and Examples

Difficulty LevelLowHighExample
Easiest 2 2 Puzzle   ·   3-steps   ·   All-steps   ·   Solution grid
Easy 3 4 Puzzle   ·   3-steps   ·   All-steps   ·   Solution grid

Derived Signature Puzzles:

Puzzle NamePuzzle
WORD Thumbnail of a WORD puzzle.