# Number Net

## Rules Edit

Link pairs of identical numbers so that each number represents the number of cells on the link, including the cells with the numbers. Cells containing 1 represent paths that are 1-cell long. Paths must follow horizontal or vertical directions and are not allowed to cross or overlap other paths.

(Rules and example from WPC 2017 IB)

### Rule variations Edit

**Sum Numberlink**from WPC 2016/Round 14 was a Number Net puzzle with an additional constraint of a path not occupying 2x2 cells. As the name suggests this is probably sought to be a variant of Arukone but is much closer to Number Net in terms of the ruleset.

## History of the puzzle Edit

According to Conceptis Ltd, the puzzle was invented by one editor of the Byakuya Shobo publishing company. ^{[1]} When did this happen is uncertain, but probably in the late 1990s on *お絵かきパズルランド* (Oekaki Puzzle Land) magazine, first published in 1995.

Most commonly this puzzle is known as Link-a-Pix (a name by Conceptis), but the name of this article is based on the original name given by Byakuya Shobo, ナンバーネットロジック (Number Net Logic).

## Appearances in the past WPCs Edit

- WPC 2017/Round 17 by by Rohan Rao
- WPC 2016/Round 14 (part of a Permaculture hybrid) by Matúš Demiger
- WPC 2013/Part 8