Gattai

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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.

Gattai-2

Sensei

File:Sensei.png

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

DoubleDoku

File:Doubledoku.png

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

Gattai-3

File:Gattai-3.png

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

Gattai-4

Sohei

File:Gattai-4-sohei.png

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

Butterfly

File:Gattai-4-butterfly.png

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

Flower

File:Gattai-4-flower.png

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

Gattai-5

Samurai

File:Gattai-5-samurai.png

Sudokus: 5
Overlapping boxes: 4
Names: Samurai

Flower

File:Gattai-5-flower.png

Sudokus: 5
Overlapping boxes: 9 (4 x triple, 4 x quadruple, 1 x quintuple)
Names: Flower

Wing

File:Gattai-5-wing.png

Sudokus: 5
Overlapping boxes: 6
Names: Wing

Kazaguruma

File:Gattai-5-kazaguruma.png

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

Gattai-8

File:Gattai-8.png

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

Gattai-11

Shogun

File:Gattai-11-shogun.png

Sudokus: 11
Overlapping boxes: 12
Names: Shogun

Gattai-13

Sumo

File:Gattai-13-sumo.png

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

Gattai-25

Shaolin

File:Gattai-25-shaolin.png

Sudokus: 25
Overlapping boxes: 36
Names: Shaolin

See Also