I really enjoy this game, but I do have some frustrations with it. In arcade mode, most of the time you do not have enough bills to make it to the gold medal. Using smaller bills can get you a little further, but only so far. There is not enough total cash.
In time attack, there is an even bigger problem. Every so often it blacks out bills; this is neat because it forces you out of your rhythm. However, it sometimes makes the number impossible to reach. For instance, it will black out the one and five dollar bills when youre trying to reach an odd number.