version 1.0 (11-12-25)

version 2.0 (12-12-25):

renamed level 12 to level 11 (level 11 was a trivial testing level by accident).

replaced levels 12
...0.1.1
...1..0.
..0.....
.....0..
..1.01..
0.0....1
.......0
.0...0.0
and 22
..0..0.0
0.0....1
1.1...0.
0.1.0...
.0.....1
.....1..
...0...1
.......0
by new levels.

restart removes error message.