Solver App for Android and iPhone
Strategies for Number Puzzles of all kinds
Solvers
Puzzles
Latest Apps
Str8ts
Other

Latest Changes and Additions

A quick list of the latest updates and additions to this site:

Death Blossom
Date Created: Friday 11-Apr-2008
Last Updated: Sunday 21-Aug-2016
Sudoku Strategy. Death Blossom is based on extending Aligned Pair Exclusion but uses Almost Locked Sets to make some clever reductions. It is complex.

Multiples
Date Created: Saturday 20-Aug-2016
Last Updated: Saturday 20-Aug-2016

Related Sets Algorithm
Date Created: Saturday 23-Jul-2016
Last Updated: Saturday 20-Aug-2016
James Pike introduces Related Sets Algorithm

What's New
Date Created: Monday 17-Aug-2009
Last Updated: Friday 15-Jul-2016

BUG
Date Created: Friday 11-Apr-2008
Last Updated: Sunday 1-May-2016
Sudoku Strategy. BUG stands for Bi-Value Universal Grave. It is a formation that relies on the uniqueness of the solution and an array of bi-value cells.

Almost Locked Sets
Date Created: Saturday 12-Apr-2008
Last Updated: Sunday 24-Apr-2016
Sudoku Strategy. Almost Locked Sets are complex building blocks that all allow one to continue a chain. They are groups of cells of size N with N+1 candidates in them.

AIC with ALSs
Date Created: Saturday 12-Apr-2008
Last Updated: Saturday 23-Apr-2016

Sudoku Solver - Version History
Date Created: Sunday 13-Apr-2008
Last Updated: Saturday 26-Mar-2016

Windoku Strategy
Date Created: Saturday 26-Mar-2016
Last Updated: Saturday 26-Mar-2016

Unique Rectangles
Date Created: Friday 11-Apr-2008
Last Updated: Sunday 6-Dec-2015
Sudoku Strategy. Unique Rectangles takes advantage of the fact that published Sudokus have only one solution. There are many formations and strategies based on this notion and they are explained here.