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Although the 9×9 grid with 3×3 regions is by
far the most common, numerous variations abound: sample puzzles
can be 4×4 grids with 2×2 regions; 5×5 grids
with pentomino regions have been published under the name
Logi-5; the World Puzzle Championship has previously featured
a 6×6 grid with 2×3 regions and a 7×7 grid
with six heptomino regions and a disjoint region. Even the
9×9 grid is not always standard, with Ebb regularly
publishing some of those with nonomino regions. Larger grids
are also possible, with Dell regularly publishing 16×16-grid
Number Place Challenger puzzles and Nikoli proffering 25×25
sodoku the Giant behemoths. Another common variant is for
the numbers in the main diagonals of the grid to also be required
to be unique; all Dell Number Place Challenger puzzles are
of this variant.
Five 9×9 grids which overlap at the corner regions
in the shape of a quincunx is known in Japan as gattai 5 sodoku
"five merged sodokus". A three dimensional sodoku
puzzle was invented by Dion Church and published in the Daily
Telegraph in May 2005.
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