A bit more time consuming than just having 5 minutes to spare, but I'm totally hooked on this game. basically, you manage a tower full of cats and you have to decorate their rooms with personalized furniture. You do this by solving nonograms (also known as picross puzzles), which give you currency to buy the furniture. the art is super cute and there's also barely any ads, but you can also play it completely offline, which won't deliver you any ads. so many games need wifi nowadays that it's really nice for when I don't feel like using any mobile data.