level: simple
..28.49...3.....6..8.....5...4...8.....9.1......7.6.....3...4...1..3..2.9.8...7.5 | initial |
652814973439257168781693254174325896326981547895746312263579481517438629948162735 | solved |
level: simple
http://www.sudokuwiki.org/Interesting_Sudokus 23 Clues, minimal "Vase“ Discovered by Klaus Brenner