The Six Parts
The move set reads like a dance-class syllabus and runs like a two-step. That is the point.
The Babydoll two-step is six parts, and the names do most of the work: chugs - the little hops that keep the feet on the grid; the side step, which is where the two-step earns its name; the ball changes, the shift of weight from ball of foot to heel that gives the step its glide; the step-touches, which pair the weight shift with a tap; the arm wrap, the one part above the waist; and the shoulder shake, the finisher that reads from across a room. None of the six is hard on its own. The trend's design is that the six, run in a loop, are the whole dance - and that anyone who can stand can learn the loop in one listen.
Why small parts, not one hard move. A two-step with a hero move dies when the person next to you drops it. A two-step of six small parts dies nowhere - the loop keeps moving, the missing part shows up on the next cycle, and the room keeps dancing. That is the engineering of the trend, and it is why the format spread the way it did: no lesson, no correction, no second take. The six parts are the reason a clip of a family doing it lands the same as a clip of the singer, because neither one is performing - both are joining.
How the game maps them. The lane in the game keeps four of the six as note types - the side step, the step-touch, the arm wrap, and the shoulder shake - with the chugs and ball changes folded into the timing of the line itself, which is how they work in the real thing: they are not moves, they are the spacing between the moves. Three notes in a row land and the Babydoll Combo shows, and the character's loop gets cleaner, which is the game's version of the six parts landing as one dance instead of six separate tries. The dance power card counts the parts you held through the tight judging - which of the six survived the chorus.