Working systematically

There are 615 NRICH Mathematical resources connected to Working systematically
Impuzzable
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Impuzzable

This is about a fiendishly difficult jigsaw and how to solve it using a computer program.
Latin Squares
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Latin squares

A Latin square of order n is an array of n symbols in which each symbol occurs exactly once in each row and exactly once in each column.
Learning Mathematics Through Games Series: 4. From Strategy Games
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Learning mathematics through games series: 4. From strategy games

Basic strategy games are particularly suitable as starting points for investigations. Players instinctively try to discover a winning strategy, and usually the best way to do this is to analyse the outcomes of series of 'moves'. With a little encouragement from the teacher, a mathematical investigation is born.