Rules -- Twincognito

Twincognito was invented by the Japanese puzzle company Nikoli (under the name Hitori ni shite kure, meaning "let me alone"). It is one of several of their puzzles based on the unique rules governing the arrangement of black cells in Japanese crosswords.

1. Determine which cells are black and which ones are white according to the following rules.
2. No two white cells with the same number may be in the same row or column.
3. No two black cells may share an edge. All of the white cells must be connected to each other through their edges.

Blog Archive