Samurai Sudoku - Rules & Guide

Tip 1: Overlapping squares are the "portal" of information

These four overlapping 3x3 grids are the key to solving Samurai Sudoku. When you derive a number in the outer Sudoku and fill in the overlap, that number immediately becomes a known condition in the Central Sudoku; and vice versa. You need to constantly use these "portals" to pass puzzle-solving clues between 5 independent but connected boards.

Tip 2: The unique advantages of the center disk

The 9x9 Sudoku board in the center is particularly special because it has four corners that are connected to other boards. This means it is the area of ​​the heart that receives the most external cues and radiates them the fastest. When the peripheral board is in a deadlock, trying to concentrate firepower to break through the central board can often achieve the effect of "moving the whole body with one move".

Tip 3: Long-term crossing elimination method

Although the boards are staggered, since each 9x9 board still follows the standard row and column exclusion rules, you can perform long line scans across the boards. For example, if you want to fill in a number in the overlapping area of ​​the upper left Sudoku, you not only have to look at the constraints of the upper left Sudoku itself, but also scan along the row or column corresponding to the central Sudoku to see if it has been excluded by the known numbers at the far end of the central Sudoku.

Example image: observe the 3x3 overlap area of the central disk and the four peripheral disks

A: Almost impossible. Samurai Sudoku was designed so that the initial clues for each sub-board were extremely scarce. Any 9x9 board could not be solved independently due to insufficient information. You have to shuttle back and forth among the 5 boards, pushing wherever there is a breakthrough, and piecing together all the fragmented clues.

A: No. The four outer 9x9 Sudokus do not overlap in space, nor do any of their rows run through them. The only connection between them is that they must pass through the fifth Sudoku in the center to transfer and interact with clues.