This puzzle front / back promises long periods of autonomy my students (CP / EC1). They can all (in turn) participate in the construction of this puzzle. In addition, there are just over 200 rooms but as they are front / back, sorting is finally performed on 400 pieces! The parts are of very good quality to be used in community. The storage case is very pretty, which makes it even better. In addition, both sides of the carrying case are the models of the two puzzles. The suitcase holds right when they put it on the edge, where space saving is much more convenient as well.