- Here is the grid for standard sudoku. Invented by the original designers of "Number Place Puzzle".
- Here is the grid for four-by-four sudoku. Good for introducing kids to sudoku and sudoku-like puzzles.
- Here is the grid for 16-sudoku. Probably invented by the designers of the original sudoku. We have samples of 25 and 36 sudokus, and those were requested by various correspondents, but we never heard about anyone actually solving any of those.
- Here is the grid for diagonal-sudoku puzzle. Probably invented by the designers of the original sudoku. Some people call it kokonitsu.
- There is even
a diagonal 4x4 sudoku (for kids). Invented by
**Raphael Finkel**. - Here is the grid for
Five-spot sudoku-like puzzle. Invented by
**Raphael Finkel**. This and the next one are great for kids who find 4x4 sudoku too easy. Some people call these (and similar, see below) grids "jigsaw" sudoku. - Here is the grid for
Six-spot sudoku-like puzzle. Invented by
**Raphael Finkel**. - Here is the grid for
Seven-spot sudoku-like puzzle. Invented by
**Raphael Finkel**. - Here is the grid for
Eight-spot sudoku-like puzzle. Invented by
**Raphael Finkel**. - Here is the grid for
Nine-spot sudoku-like puzzle. Invented by
**Raphael Finkel**. This is a grid alternative to the classical 9x9 grid with square sections. This grid offers an opportunity for truly subtle puzzles. - Here is the grid for
12 by 12 puzzle based on so-called combinatorial designs.
Invented by
**Mirek Truszczynski**. - Here is the grid for
18 by 18, double sudoku-like puzzle. Invented by
**Raphael Finkel**. - Simplified version of the previous problem.
Here is the grid for
the "doubled" version but not of the classical sudoku, but the 4x4
sudoku ("kid-version")
Invented by
**Raphael Finkel**.

A paper entitled "So you
want to generate your own sudoku?" where we describe what
does it take to write a decent software generating sudoku and similar
puzzles. **Requires some knowledge of SAT or like solvers, but hints at many
other possible puzzles that may be done with the same software.** This
includes all the above grids (no source code provided, just the technology
discussed there). We wrote this paper last summer, and it still can be
greatly improved.

We publish it in expectetion that SAT/ASP people should be able to use their technology for fun, not only for profit.

**Last modified: January 5, 2006 **