One of my favorite phone games is a puzzler called Piczle Lines. The core puzzle set is free, and you pay for additional sets. It's successful, mentally engagin

One of my favorite phone games is a puzzler called Piczle Lines. The core puzzle set is free, and you pay for additional sets. It's successful, mentally engaging, and fun as hell. Come to think of it, the positive examples are mostly just patching over a business model constraint: that the App Store doesn't have a way to offer a demo, essentially pushing game creators into either Freemium or split Ad/Pro versions.