Samurai sudoku
Five overlapping 9×9 grids explained — practice house logic on a live classic board until the full samurai engine ships.
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Samurai sudoku
Samurai sudoku (also called five-grid sudoku) overlaps five classic 9×9 puzzles: one in the center, four on the corners. Shared boxes must agree — a digit in an overlap is locked for every grid that owns that box.
A full playable samurai engine is a later phase (heavy UI + generation). Today this page teaches the layout and gives a live classic 9×9 so you can practice the same house logic while you wait for the five-grid board.
When
When to use
You searched samurai sudoku; you want the overlapping idea explained; you can practice on classic meanwhile.
When not
When not to
Want only a quick classic game → play / easy. 16×16 mega → sudoku 16×16. Killer cages → killer sudoku.
Defaults
Assumptions
True samurai = five linked grids. This URL does not fake a five-grid UI yet. The live board is classic medium 9×9 practice.
Steps
How
- Picture five boards with corner overlaps sharing boxes.
- Digits in shared boxes count for every owner grid.
- Practice constraint discipline on the classic board above.
- Come back when the five-grid mode ships.
Worked notes
Examples
- Center-grid box overlaps a corner grid → one digit serves both grids — they must agree
- You solve one arm of the samurai → clues feed into the center through shared boxes
Watch-outs
Gotchas
- Printable samurai PDF packs are a different product.
- We will not paste a screenshot and call it playable.
- Harder than one classic grid even when the rules feel familiar.
Nearby pages
Compare
Classic play: play sudokuStrategy: sudoku strategy16×16: 16×16 sudokuKiller: killer sudoku
Controls
Quick controls
- Hint — a cell/digit, technique name, and short reason.
- Check — flags conflicts without revealing the full grid.
- Pencil — candidate notes for empty cells.
- New puzzle — same difficulty band, fresh seed.
- Daily — fixed local seed for the calendar day.
- Erase — clear the selected cell (not givens).
FAQ
Common questions
Can I play full samurai here today?
Not yet. The live board is classic 9×9 practice; five-grid play is a later phase.
How many grids in samurai sudoku?
Five overlapping 9×9s in the standard samurai layout — center plus four corners.
Same rules as classic?
Each grid still needs 1–9 in every row, column, and box; overlaps must agree across grids.
Account required?
No. Progress on the practice board stays in this browser’s local storage.