From Wikipedia:
Mini Metro is a puzzle strategy video game developed by New Zealand indie development team Dinosaur Polo Club. Players are tasked with constructing an efficient rail transit network for a rapidly growing city. The game’s visual style makes use of bold colours and simple geometry to replicate the appearance of modern transit maps. The game uses a procedural audio system to generate sounds based on the player actions and transit network, with inspiration from works of minimal music.
Mini Metro uses Helvetica to mimick the appearance of transit maps in cities such as New York City. In the wordmark, the letter o is substituted by a circular station marker.