level: simple
..5....9..8.4...156...9.2...3.1.......7...6.......5.8...6.3...285...2.6..7....3.. | initial |
725813496389426715614597238238169574597384621461275983946731852853942167172658349 | solved |
level: simple
http://www.sudokuwiki.org/Interesting_Sudokus 24 Clues, minimal "2x3x3 mirrored by diagonal“ Discovered by Klaus Brenner