Welcome to SudokuOne.Com, home of:
   Last Update: September 4  2025              Pluralitas non est ponenda sin neccesitate 
Sudoku Solver

and

Logic Editor

 

NEW! 2025 Version 3

 



What is Xsudo?

 Xsudo combines a powerful solver, logic analyzer, and editor in one. Its unique native Sudoku logic engine supports all possible Sudoku logic well beyond current Sudoku methods. The unique editor allows logic to be entered, edited, and analyzed in real time either stand alone or while solving puzzles.

  • Clear 2D and 3D puzzle and logic display
  • Simple mouse based editing environment
  • Manual and auto-complete logic entry
  • Features to support manual solving
  • A variety of tools for working with logic
  • Logic assumptions including uniqueness
  • Puzzle file organizer and puzzle explorer
  • User URLs, remember every puzzle's source 
  • Extensive cut and paste for data exchange
  • PNG image and thumbnail output
  • Built in help, tutorials, and reference library


Features, including versions 2 and 3

 

Download Xsudo

 

Brief Introduction to Sudoku


Introduction to Sudoku Methods


 Using Xsudo

Examples Library



Sudoku Resources:

 

Sudopedia

A free Sudoku reference guide


The New Sudoku Players Forum

The premier Sudoku site

 

Contact  me at:

rab3@allanbarker.com

Universal Logic

for Sudoku

 

What is Universal Logic?

Xsudo uses Sudoku’s native, intrinsic logic —reasoning directly with rows, columns, boxes, cells, and their interactions— rather than a collection of solving methods each designed to find specific logic or patterns. This allows Xsudo to express and find any and all possible logical deductions in Sudoku, unlike traditional methods.

This universal logic allows Xsudo to implement real-time editing, analysis, and a powerful interactive solver using one efficient computer algorithm. Xsudo is not a solving method but a tool based on Sudoku’s natural logic to work with Sudoku in multiple ways. This same natural logic also reflects how humans approach manual solving.

A Universal Logic for Sudoku

 

 Logic Examples

 

A Short Summary


   Other Places