up to the dungeon its very easy but then once you get to the forest it got really challenging to finish it for me
it says in code.org its recommended for middle school students but I think maybe he could do it
There are over 100 free levels unless you are in Brazil or China (unless they changed the policy)
If he is able to pass the first world it will be fine, although he may struggle with some of the later levels with vectors and such. Anyway, they bill monthly so if it becomes too hard you can just stop.
Oh, you should let him keep coding. This is a very good material for learning, especially to me. Once he is almost done, you could subscribe, but I don’t use money by signing up as a Adventurer to get levels that you have to subscribe to. And I’m just a 10 year old, and I’m on the desert.