Help Tippy to give coins and bills to their client. You have to give exactly the number of bills that they require. The time is limited, and you'll have more clients as you pass to next levels.
Arrow keys left/down/right to indicate, respectively, a coin, a green bill and a red bill. You have to press every key the same number of times as this figure appears visible at the screen. If you press more or less times a key corresponding to visible coins or bills, you'll loose and will have to restart.