set of Starter Cards on powerpoint from the wonderful liverpool
maths team. The idea is that you print out the cards, laminate
them, and use the prompts on the back to engage the pupils in
a stimulating discussion.
the popularity of SuDoku seems to be on the way down, I still
believe it is a powerful tool for developing students' thinking
and problem solving skills... and it is pretty good for leaving
as cover work too!