Rated 4.8 stars from 12,800 Reviews
"Mini Metro is a game about designing a subway map for a growing city. Draw lines between stations and start your trains running. Keep your routes efficient by redrawing them as new stations open. Decide where to use your limited resources. How long can you keep the city moving?"
It was $0.99 and $1.49 last year a couple times so might wait for better price.