Elevate!

With your new position as an elevator operator, you're tasked with delivering the stick-figure occupants of a 10-story building to all of their desired floors. In the morning, your task might be easy, but as the day progresses and more people arrive, keeping all the building's occupants happy will become more difficult. Try to be efficient because nobody likes wasting time waiting for the elevator. If too many complaints are registered, you'll lose this new job.