Hello Tower
General
Hello Tower is an ATC apron and ground control simulator. It includes around 20 airports. More coming from time to time.
There are two airport sizes. The real size, which can be quite demanding to play especially on smaller screens. The simplified airport, which is as the name implicates, a smaller version of the airport. Here the situational awareness and the overview is better. That doesn't mean that it is less demanding to play.
Modes
Generally there are two different game types. Regular and holding point madness.
Regular
In regular mode you have to manage departures and arrivals as well as towing aircrafts. In higher difficulty there are also emergencies to handle.
Holding point madness
Holding point madness focuses only on departures on a specific runway.
Objective
In order to successfully complete a level the minimum required points must be achieved and all flights must have departed. For each departure, arrival, repositioning and emergency you get points. Departure points are dependend on whether it was on time or not. In custom mode (easy mode setting is on) only the number of departures is required. When you successfully complete a level it unlocks the next one.
Difficulty
For not yet successfully completed levels there are three modes of difficulty:
-> Easy, Medium and Hard.
As soon as you have completed the level, a new game mode is available. In custom mode you can adjust the game settings as you like. See respective page for explanation of the game settings.