I finally finished this one. There were 300 puzzles total, and it just kept going and going and going, far more than I expected, but hey! It was 300 picross puzzles, so, great.
There were ones in the last few sets that were actually hard, where you have to start trying to predict, and that's not my favorite. Picross should never have guessing involved.
But! In the Wario puzzles, the last option in the menu yellows out blocks, like using a pencil, and if you select the left option when you are done, it completes them for you. Select the right option, it'll undo all your moves.
There were ones in the last few sets that were actually hard, where you have to start trying to predict, and that's not my favorite. Picross should never have guessing involved.
But! In the Wario puzzles, the last option in the menu yellows out blocks, like using a pencil, and if you select the left option when you are done, it completes them for you. Select the right option, it'll undo all your moves.