Japanese crossword «Flower»

I think "Nobody" meant if you didn't get any squares wrong, the system automatically lets you know you got it right. I suppose newbies aren't aware of that. The "check the crossword" button is more for if you want to make sure you're on track while doing one of the puzzles. It's also helpful if the system doesn't indicate you've correctly solved the puzzle and you absolutely can't see where you went wrong! (Usually with me, I've missed one square somewhere -- usually in puzzles with lots of single pixels.)