Twincognito was invented by the Japanese puzzle company Nikoli. The name comes from mathgrant (I don't feel like linking it anymore, just look at earlier rules or something to find it if you want it).
1. Make each cell white or black.
2. No two black cells may share an edge.
3. All white cells must be connected to each other through their edges.
4. No two white cells with the same number may be in the same row or column.
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