What makes the iOS version of Mini Metro special is how you interact with it. The premise of the game is simple. You are in charge of building a transit system for your citizens. Mini Metro starts by tasking you with building London’s Tube from a few initial train stops that you connect with rail lines by dragging your finger between them. It’s the direct manipulation of the transit system — building parts up and tearing others down — that makes Mini Metro so engrossing.
Here’s some screenshots of my last three games.