Latest Changes and Additions

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

Unique Rectangles
Date Created: Friday 11-Apr-2008
Last Updated: Wednesday 17-Dec-2025
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.

What's New
Date Created: Monday 17-Aug-2009
Last Updated: Monday 8-Dec-2025


AIC with ALSs
Date Created: Saturday 12-Apr-2008
Last Updated: Monday 1-Dec-2025


Hidden Candidates
Date Created: Wednesday 9-Apr-2008
Last Updated: Monday 24-Nov-2025
Sudoku Strategy. Hidden Pairs, Triples and so on - these are the candidates in cells aligned on a row, column and box which can be used to remove other candidates the formation is aligned with.

Main Page
Date Created: Thursday 10-Apr-2008
Last Updated: Wednesday 19-Nov-2025
Strategies for Sudoku, Sudoku X, Killer Sudoku and Jigsaw Sudoku - and the home of logical puzzle maker Andrew Stuart

Rectangle Elimination
Date Created: Saturday 7-Oct-2023
Last Updated: Thursday 30-Oct-2025
A new tough strategy by Ken Reek

Daily Kakuro
Date Created: Wednesday 25-Jan-2023
Last Updated: Tuesday 28-Oct-2025
Play or Print the Daily Kakuro Puzzle by Andrew Stuart

Daily Sudoku X
Date Created: Monday 16-Sep-2024
Last Updated: Tuesday 28-Oct-2025


Cage Unit Overlap
Date Created: Tuesday 22-Mar-2011
Last Updated: Monday 27-Oct-2025
Killer Sudoku Strategy. Cage Unit Overlap looks at the intersection of a cage with a row, column or box to find eliminations.

Triple Pointing Pairs
Date Created: Sunday 26-Oct-2025
Last Updated: Monday 27-Oct-2025