Its an interesting puzzle, I'd recommend adding a feature to mark cells you know are dark. It also may need another constraint as solutions are non-unique
Sum It! Logic Puzzle Game
Sum it! Find the right values by adding numbers.
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I've played a few levels now and it's very enjoyable and surprisingly hard at first. If anything, I'd love if there was a way to cross out squares that I know are incorrect, and if there were more difficult modes, maybe involving negative numbers or something. The zero squares also seem unnecessary, considering how they don't actually do anything. Pretty fun overall!