Mirrored from Sudopedia, the Free Sudoku Reference Guide

Gattai

Gattai is a Japanese word meaning merged or fused. In the world of Sudoku, this term is used for overlapping Sudokus. A number indicates how many 9x9 Sudokus are in the puzzle.

The overlapping regions always contain complete boxes, although it is theoretically possible to overlap any number of cells. For a puzzle maker, partial overlapping boxes are more difficult to create.

Many of these overlapping patterns have been named by their publishers. For each pattern, the most commonly used name is listed first, followed by alternative names.

Contents

Gattai-2

Sensei

image:Sensei.png

Sudokus: 2
Overlapping boxes: 2
Names: Sensei, TwoDoku

DoubleDoku

image:Doubledoku.png

Sudokus: 2
Overlapping boxes: 4
Names: DoubleDoku, Gattai-Near-2

Gattai-3

image:Gattai-3.png

Sudokus: 3
Overlapping boxes: 6 (5 x double, 1 x triple)
Names: Gattai-3, Triple

Gattai-4

Sohei

image:Gattai-4-sohei.png

Sudokus: 4
Overlapping boxes: 4
Names: Sohei, Ring, Diamond

Butterfly

image:Gattai-4-butterfly.png

Sudokus: 4
Overlapping boxes: 12 (8 x double, 4 x quadruple)
Names: Butterfly, Gattai-Near-4

Flower

image:Gattai-4-flower.png

Sudokus: 4
Overlapping boxes: 9 (4 x double, 4 x triple, 1 x quadruple)
Names: (open) Flower

Gattai-5

Samurai

image:Gattai-5-samurai.png

Sudokus: 5
Overlapping boxes: 4
Names: Samurai

Flower

image:Gattai-5-flower.png

Sudokus: 5
Overlapping boxes: 9 (4 x triple, 4 x quadruple, 1 x quintuple)
Names: Flower
Note: This is indeed exactly the same as Flower (4). The central sub-grid in flower (5) is superfluous since all its rows, columns and boxes are already defined by one of the other sub-grids.

Wing

image:Gattai-5-wing.png

Sudokus: 5
Overlapping boxes: 6
Names: Wing

Kazaguruma

image:Gattai-5-kazaguruma.png

Sudokus: 5
Overlapping boxes: 8
Names: Kazaguruma (Windmill)

Gattai-8

image:Gattai-8.png

Sudokus: 8
Overlapping boxes: 8
Names: Gattai-8

Gattai-11

Shogun

image:Gattai-11-shogun.png

Sudokus: 11
Overlapping boxes: 12
Names: Shogun

Gattai-13

Sumo

image:Gattai-13-sumo.png

Sudokus: 13
Overlapping boxes: 16
Names: Sumo, Daimyo, Harakiri

Gattai-25

Shaolin

image:Gattai-25-shaolin.png

Sudokus: 25
Overlapping boxes: 36
Names: Shaolin

See Also

This page was last modified 02:46, 10 March 2009.