At $20 it's pretty pricy, but it has tons of content and is made by the Picross people. If you like Picross you'll love this.
https://store.steampowered.com/app/3204020/Juufuutei_Radens_Guide_for_Pixel_Museum/

https://store.steampowered.com/app/3204020/Juufuutei_Radens_Guide_for_Pixel_Museum/
It's hard mode apparently. Kinda expensive though.
But hey, ~50 hours of play time assuming you only do each puzzle once isn't bad for 20 bucks.