Look for the trends that customers like. If you get to know the chart above, you'll be to anticipate what they want and make the clicking easier.

On harder levels where the line is going too fast, don't pick up the money right away. There are only four spots in the line, so only allow two openings at a time so that you can serve everyone quickly.

Have someone play with you, and have them watch for which customers are getting angry. This makes the game much easier.