We have found that teams of 4 are optimal. However, the most successful teams are those that can work together without too much bickering. (A little bickering during Fantastic Race® is expected, even encouraged.) Team size doesn’t matter. So, if you’re a duo that can’t drive to the market without a major conflagration, you may be better off asking some other folks to come along and play (if only to keep you separate). If however, you get along as well as the parents of the creators of Fantastic Race®, you should call a divorce attorney. Kidding again. You’ll be fine.