Mirrored from **Sudopedia**, the Free Sudoku Reference Guide

An **orbit** is a group of cells that must either all contain a given or none of them can.

This term is used to describe the effects of symmetry in a Sudoku.

Orbits can have a size of 1, 2, 4 or 8 for standard symmetry classes, and occasionaly 3, 6 or 9 for alternative symmetry classes. Large orbits increase the chance of redundancy in the givens.

This page was last modified 11:32, 3 November 2007.