I started Artifact Seekers last night and have already played almost 5 hours. I'm pretty certain that even though it says Season 1, it includes all the seasons so far. I am just in the first chapter "Tropical Island". There are a lot of puzzles and they are not easy but so far, have been manageable. There are some that you don't have to do but I guess doing them gets you stars as I think finding the collectibles and morphing objects does also. I don't know what the stars do but I think they get you more coins for more hints. I'm not sure. I haven't gotten any stars yet to see if my coins will increase. They start you with 50 I believe. I haven't used any hints but it looks like they might cost different amounts of coins in different areas because I see a "5" down by the hint button most of the time but in one area tonight I saw a "25" there. Again, not sure about all this.
So far it is pretty fun. I find the time slipping away quickly while I'm playing. You really need to use pen and paper to make notes of things you think might be clues and you also really have to click all around because things are all over the place and you don't know where. There is a whole lot of stuff to do.