I'm having a good time with these battleship puzzles. I've managed to figure out whatever wasn't clicking for me the last time, at least so far with the "easy" puzzles. It's not as satisfying to finish one as picross, but it has the advantage of being playable on a phone without panning or zooming; 10x10 is as big as they get. No ads, only IAP is more puzzles ​ https://play.google.com/store/apps/details?id=com.conceptispuzzles.battleships