Mirrored from Sudopedia, the Free Sudoku Reference Guide


A loop is a cyclic pattern of linked cells or candidates.

Loops are usually represented by chains, where the first and the last cell are the same. Like a chain, implications in a loop can either travel in a single direction or in both directions. A bidirectional loop is better known as a Nice Loop.

Examples of loops are:

Notation systems are similar to chain notation, with Nice Loop notation especially designed for loops.

This page was last modified 19:09, 26 October 2007.