See also: Matching titles (44)

The challenge is to find the values of the variables if you are to solve this Sudoku.

This sudoku requires you to have "double vision" - two Sudoku's for the price of one

You are given the Lowest Common Multiples of sets of digits. Find the digits and then solve the Sudoku.

A Sudoku based on clues that give the differences between adjacent cells.

Special clue numbers related to the difference between numbers in two adjacent cells and values of the stars in the "constellation" make this a doubly interesting problem.

This second Sudoku article discusses "Corresponding Sudokus" which are pairs of Sudokus with terms that can be matched using a substitution rule.

A pair of Sudokus with lots in common. In fact they are the same problem but rearranged. Can you find how they relate to solve them both?

In this Sudoku, there are three coloured "islands" in the 9x9 grid. Within each "island" EVERY group of nine cells that form a 3x3 square must contain the numbers 1 through 9.

This Sudoku problem consists of a pair of linked standard Suduko puzzles each with some starting digits

Activities and material for teachers.

Problems and toughnuts open for solution by stage 3, 4 and 5 students

Resources to accompany Fran's and Charlie's workshops at the ATM & MA Easter Conferences.

Page of resources for STEP Prep Summer School 2014

Resources to accompany NRICH team presentations at UKMT 2015 Teacher Meetings.

Resources to accompany Charlie's workshops.

Some last minute hints and tips for problem solving.

An article for teachers based on a lecture and workshop activities at the NZAMT conference in New Zealand 2007

Jenny Piggott reflects on the event held to mark her retirement from the directorship of NRICH, but also on problem solving itself.

Can one example help us to perceive the generality?