I work in a preK -4 school, and my students have enjoyed the Hour of Code games and puzzles. I know little about programming, but am considering purchasing a hands on activity kit that I could use with an entire class, and looking for advice. I think Little Bits is too advanced for my students, plus I'm afraid some pieces would disappear. In the Demco catalog, the Code and Go Robot Mouse Activity set and the Ozobot both look fun. Anyone have experience with these or have other ideas? Or can you recommend where to look?