There's always more to do. More things to expand. Usually after a couple days I get bored with games like this, but Diggys keeps you coming back. Even if it's not for long cause life wants your attention. And the map feature to revisit areas for the perfect clear if you didn't the first time or go get specific items you need for upgrades is a nice touch. It's also built nicely so that you dont HAVE to spend money to keep playing.