Puzzle rules
N-Sudoku / Double Sudoku
Complete every overlapping 9×9 Sudoku grid. Each individual grid must contain 1–9 exactly once in every row, column, and 3×3 box. Grids overlap in shared 3×3 corner boxes, so each shared cell has one value that must satisfy both grids.
How to solve
Complete rules
Goal: Complete all overlapping Sudoku grids. Rules: - Each constituent 9×9 grid follows standard Sudoku rules. - Every row, column, and 3×3 box within each grid must contain digits 1–9 exactly once. - Neighboring grids overlap in a shared 3×3 corner box. - An overlapping cell is a single shared cell: its digit belongs to and must satisfy every grid covering that position. - With two grids, this forms the classic Double Sudoku layout. Five grids form the familiar Samurai-style layout. - Given numbers are fixed.