Benesse Kodomo Challenge Step (for 4-5 year olds) Playable! English DVD March issue: Wonder Discovery Theater ~ Jump April issue ~ December (for 5-6 year olds) Thinking and Discovery Theater A set of 6 DVDs. They are in a paper case, and each main program is about 25 minutes long. There are no noticeable scratches or stains on the case or DVDs. Since children watch them with concentration, they are also convenient for things like car trips.