I feel it's easier with with more kids since you can let them play together. It's hard with one kid or kids that are not of similar age, since they have nobody to play with them at home. Of course, there are some kids who can play alone with legos or dolls. I know when I was growing up me and my brother where a year apart and we could play for hours together with legos or toys, we did also watch a lot of TV, this was the early 90s.