A free app for Android, by High Octane Games.

The Bus Simulator 2021: Bus Driving Game is a driving game with an open world, where you can travel around a city to pick up passengers and drop them off at their destination. You can choose from different buses and play thrilling terrains and routes.

You can drive on various city roads and highways. You can also choose to drive in the cities or in off-road routes such as mountains. The game has a very intuitive interface and you can control the bus with a steering wheel or with arrow buttons.