Our daughter goes to the second class and was immediately excited about the game. The first two stages are certainly meant for younger children, the stages 3 and 4 are also for older children still exciting. Then there are the special tasks that are a good concentration training for adults, as in general the whole game also trains the ability to concentrate next to Convert. A small downside: The Stage 4 does the same a big jump from the add / subtract bodies halving / doubling to multiplication and division, the tutorial of our daughter it would be nicer to introduce separately the division - but even that one can solve, if an adult, or an older child plays along.