Our younger son created this puzzle using a Javascript program which he wrote himself:
I used Andrew Stuart's site to check this puzzle and it graded it as 305. The solve path involved two uses of pointing pairs and two of simple colouring. I then ran it through Hodoku, which gave it a grade of Hard (554) so it would not have made it into my book of tough puzzles as they all have a Hodoku grade between Hard (1000) and Hard (1999). You can order it here. This link takes you to Amazon UK. If you go to your local Amazon outlet and search for "tough sudoku" + "andrew reid" you should find it there too.
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