% minesweeper 87 by Maarten Lffler, http://www.janko.at/Raetsel/Minesweeper/087.a.htm
minesweeper
medium-
10 10
..01......
..12.33...
.....12.20
.13.....31
.12.21....
....34.23.
12.....22.
01.23.....
...21.23..
......02..
mines 22
