Instructions: Click anywhere in the Spawn Zone to spawn a new player. Players are auto-controlled and will randomly choose a destination floor that they wish to travel to. You can see if they want to go up or down based on the little elevator call button in the middle.
Note that you have to manually enable the second elevator in the controls. You can also disable auto-spawning.
The game tries to find the most efficient method of getting players to their destinations, based on the the time spent waiting for the elevator and the time inside the elevator.