Compiled by Andrew Stuart, a top British puzzle maker, this collection of Su Doku will test the best. Every puzzle can be solved through logical deduction alone. But they go well beyond the level of the most difficult daily puzzles and will challenge your solving abilities to breaking point.
40 tough level puzzles to make you scratch your head
40 diabolical Su Doku that will make you tear your hair out
21 extreme puzzles, the like of which has never been seen