I can become a bit obsessed with cities and transportation. I drew countless pictures of traffic signals as a kid, and would pore over road maps. I’ll spend hours playing SimCity. I’ll read up on road signs for fun. Give me a collection of old highway plans and, well, you might not see me for the rest of the day. So when a friend tipped me off to Mini Metro, I had to play it.

In short, Mini Metro is a simple game where you build a subway system for a growing city. You have to connect stations to one another using one or more subway lines and keep passengers moving to their destination. If stations begin to overflow, the system shuts down and you lose the game.

It’s a decptively simple concept, but combine that with game art modeled after the icon NYC Subway maps, and you have a game that you might not want to quit.

The game is still in development, but you can try an alpha version of the game by visiting the Mini Metro site. Good luck getting any work done.