特點：快。所有的解都是邏輯步驟，沒有T-E。可以用它來學習一些高級的技巧。比如，今天的24H的數獨是：
005000800;186040030;070000001;000704010;007060900;060903000;800090040;040050369;009000500.
Logic are:
30x Hidden single; 24xNaked single; （54+27 = 81）
（Note: Human level tricks )
3x Block-line reduction; 1x Ling-block reduction;
2x Naked pair; 1x Naked triple; 1x Hidden pair; 1x Naked quad;
(Note: Machine level tricks. None of them can be really used in human playing.)
2x X-Wing; 2x Single Chain 4fach; 1x XY-Wing; 1x W-Wing; 1x Single Chain 6fach.
Difficulty is: Diabolical. It is the highest, and the same as the most difficult Sudok listed in previous post here!
Link for download:
http://home.arcor.de/r.sudogu/index.html
