Latest Changes and Additions

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

X-Cycles
Date Created: Saturday 12-Apr-2008
Last Updated: Wednesday 25-Feb-2026
Sudoku Strategy. X-Cycles are simple chaining strategies that stick to candidate N. They are Alternating Inference Chains based on following the consequences of turning candidates on and off.

X-Cycles (Part 2)
Date Created: Sunday 4-May-2008
Last Updated: Wednesday 25-Feb-2026
Sudoku Strategy continued. X-Cycles are simple chaining strategies that stick to candidate N. They are Alternating Inference Chains based on following the consequences of turning candidates on and off.

Daily Jigsaw Sudoku
Date Created: Thursday 8-Sep-2011
Last Updated: Wednesday 18-Feb-2026
The Daily Jigsaw Sudoku puzzle by Andrew Stuart. This Jigsaw Sudoku can be completed directly on the web page - just enter numbers in the cells. Have fun!

Daily Mini Sudoku
Date Created: Thursday 12-Feb-2026
Last Updated: Wednesday 18-Feb-2026
The Daily 6x6 Mini Sudoku puzzle by Andrew Stuart. This Sudoku can be completed directly on the web page - just enter numbers in the cells. Have fun!

The Logic of Sudoku
Date Created: Friday 27-Feb-2009
Last Updated: Thursday 12-Feb-2026


What's New
Date Created: Monday 17-Aug-2009
Last Updated: Thursday 12-Feb-2026


Naked Candidates
Date Created: Thursday 9-Jun-2005
Last Updated: Wednesday 4-Feb-2026
Sudoku Strategy. Naked Pairs, Triples and so on - these are the remaining candidates left in cells aligned on a row, column and box which can be used to remove other candidates the formation is aligned with.

W-Wing Strategy
Date Created: Tuesday 20-Jan-2026
Last Updated: Monday 2-Feb-2026


Using Unique Rectangles as Links in Chains
Date Created: Wednesday 23-Jan-2019
Last Updated: Sunday 1-Feb-2026


5 Daily Puzzles for the iPad
Date Created: Monday 21-May-2012
Last Updated: Tuesday 20-Jan-2026