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'Cubestick' printed from http://nrich.maths.org/
Once you have solved a problem it's instructive to try to think of another
(perhaps better?) method of solution. On one famous occasion I
did not expect different methods but two school students sent in not 2 but 8
different solutions of the same problem. Not content with that these two
students then generalised the problem.
See Eight Methods for Three by One
and also Why stop at Three by One
Can you beat that? I expect their teacher at Madras College will remember it.
Perhaps that school can score again, but what about other schools?
This is a challenge calling for the combined efforts of a group of
students or a whole class.