What is Samurai Sudoku?
Samurai Sudoku takes five classic 9x9 Sudoku grids and links them into one board. You may also see the same format sold in puzzle books as Ninja Sudoku or listed as Gattai-5; the rules are identical. Four corner grids surround a fifth grid in the center, and each corner shares exactly one 3x3 box with that center grid. Those four shared boxes are the same physical cells in both grids at once: fill one in, and you're making progress in two puzzles simultaneously.
How solving changes with five grids
- Shared boxes go first: since each one answers to two grids, they carry more constraints than any ordinary cell, and they usually resolve faster than the rest of the board.
- Solve in parallel, not in sequence: a digit placed near a shared box can open up moves in the neighboring grid right away, so it pays to move between grids rather than finish one at a time.
- Nothing new inside each grid: away from the shared boxes, every 9x9 section plays by the exact same rules as classic Sudoku, so your usual techniques carry straight over.
Every puzzle here is generated fresh and checked so that each of the five sub-grids has exactly one valid solution, which guarantees the whole 369-cell board has one too. If you want a longer walkthrough with worked examples, our Samurai Sudoku guide covers the rules and a few solving patterns in more depth.
