The lowest grade is first grade, so my kindergartener needs more guidance and doesn't use it as much as my first grader who can read and navigate the site on her own.
She wanted to change the appearance of her animal avatar but eventually was more interested in the lessons and hatching a little critter. There isn't a way to go back or start over, and after the easier problems she needed more guidance. We're still new to it, and I was able to find ways to help teach her how to figure it out without just giving her the answers, but it would be good to know if there are hints to help the students directly during the practices.
So far, we are happy with our trial!