## Su Doku

Su Doku is usually played on a 9 by 9 board, divided into 3 by 3 cells. You can generalize this into playing on an M×M square board broken into non-overlapping rectangular cells, each containing M squares (an obvious question is to how define a puzzle where M is a prime number). The solution of the puzzle is to place M symbols on the board such that each row, column or cell contains each symbol exactly once, without moving the initial clues. Puzzles with M<9 are called Sub Dokus, those for M>9 are called Super Dokus.

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# Sub Doku

## The mathematics of Su Doku

A Sub Doku is a Su Doku played on a smaller grid. Some Sub Dokus have special names. The individual pages contain more on the mathematics of the puzzles. If you want examples of the puzzles to solve, then just click on the links to the pdf files.

Two Doku
is played on a 2×2 grid with rules which are forced to be somewhat simpler than those of Su Doku. Nevertheless it is a great place to understand some of the complicated enumeration problems of Sudo Clues.
Shi Doku
is played on a 4×4 grid. You can either visit the page on Shi Doku by clicking on the link above, or get a pdf file with some puzzles.
Go Doku
is played on a 5×5 grid. It is an example of a Prime Su Doku.
Roku Doku
is played on a 6×6 grid. You can either visit the page on Roku Doku by clicking on the link above, or get a pdf file with some puzzles.

© Sourendu Gupta. Mail me if you want to reproduce any part of this page. My mailing address is a simple (satisfactory) puzzle for you to solve. Created on 09 October, 2005.