A free program for Android, by Gravity Infosoft.

Lift Management is a simulation game where you have to manage an elevator.

You have to manage the people who are placed in the lift. You can gain best results by piloting the elevator. If you complete all the levels in the game, you will be able to unlock the elevator door and get to the next floor.

You can see the floor that each person wants to go to. If you place more people in the same lift, it will be good for you to move to the next floor. However, each person has a specific weight and if more than that specified weight is placed in the same lift, it will be a problem. You have to manage the weight of the people and try to get the best results.

You can also use an inverter/generator to make the elevator work.