Number-in' Places

Number-in' Places is an integrated design tool for number placing puzzles (a.k.a. sudoku puzzles) tailored for publishers, experts and every puzzle fan. The app brings you the stable design system based on high-end puzzle-solving logic and GPU-accelerated responsive graphical user interface, which allow you to create, analyze and/or test-play well-composed deductively solvable puzzles easily on your device.

Screen shot of Number-in' Places (number place / sudoku puzzle authoring application for Universal Windows Platform) Get it from Microsoft

*Number-in' Places is available for Universal Windows® Platform. PC, tablet or another kind of device running Microsoft® Windows® 10 is required to use the application.
*Microsoft and Windows are either registered trademarks or trademarks of Microsoft Corporation in the United States and/or other countries.


*Pattern-based puzzle creation fulfills conversion of 9×9 dot patterns into deductively solvable puzzles. This is an optional feature. Payment is required to use this function. There are some theoretical and/or computational restrictions on pattern designs. See documentation for details.

Basics of number placing puzzle

Definitions of terms

The rules of number placing puzzle

The objective of the number placing puzzle is to fill all the empty squares on the Board with digits (1 to 9), avoiding conflictions between digits. The rules can be summarized in a brief form: Each Sub-unit must be filled with digits in a set {1 to 9}, where each digit may appear only once in the Sub-unit.

Designing number placing puzzle

Generally, a puzzle can be designed by setting some starting clue-digits on the Board so that the puzzle can satisfy following conditions*.

*The app automates all the complicated processes required to make puzzles satisfy those conditions.

Deductively solvable or otherwise

In some cases, the kinds of puzzle solving methods (that human solvers need to use to complete puzzles; either deductive methods or inductive methods) may matter. e.g. In publications for general public, a puzzle that cannot be solved only by deductive methods won't be regarded as a valid (solvable) puzzle.

*More precisely, "Solvable by using inductive methods partly". Even in such a puzzle, a large portion of the board can be filled by deductive methods. The app doesn't yield puzzles that solvers need resort to inductive methods to finish.