I was doing my second puzzle right now. It seems I just can´t solve it,
there where also 3 fields of 1s which where not marked from the beginning ( in the down left area of the puzzle )
Here is how the whole thing looks ( also searched everywhere for unconnected numbers and redid some connections on the boarders that could have been connected in different ways ).
Puzzle 3 was working fine however, seems I made some mistake in puzzle 2 I just can´t find
Edit: Just read about the cheat key in the readme, wish I had read that sooner...