dyitto wrote:How would a text format of this puzzle look like?
Here's my suggestion on this, it allows to specify land, water, and also the undefined cells (which could become land but maybe not).
If you read my walkthroughs, you will see that I already devised a version of text format for these puzzles using '@' for land and '#' for water.
But if '+' & '-' make more sense for you then I can adapt, it just takes a few clicks to perform a "replace all".
But I don't use ';' to separate cells, since for me they in a way affect my sense of perception to the horizontal connectivity between cells.
I just used '@' & '#' because they are more unusual, so can be replaced easier in a long text file of walkthroughs. If I try to do a "replace all" on '+' & '-', I will probably mess up the text in the walkthroughs.