Had to look up what a nonogram is. Ended up finishing one, pretty neat type of puzzle. One thing I would add is to mark the rows/columns where you already fulfill the requirement somehow. Maybe just make the numbers green or add a checkmark. Or red and add an X if something's wrong. Also I got confused when I checked the puzzle and it said I didn´t finish it, I didn´t realize I had to also fill in the other squares in grey. I think it would be fine to just leave them empty instead of having to fill them?
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The challenge with indicating which rows and columns have been “completed” is that any “complete” sign would look like “this row is complete AND correct”, when in fact it may not be correct at all – it just happens to match the pattern indicated by that one row. I could work around that by using a more real-time checking system, but I don’t really want to go that route; it makes it too easy to cheese the puzzle by making guesses.
I’m definitely going to implement your idea about leaving dead cells unfilled. There’s really no reason why the player should have to mark each one.
Thanks anon