A love letter to Super Mario Bros 3 and Super Mario World. Give it some time to get past the first few simple stages and get used to the simple presentation - You will find Yoshi, the Racoon Tail (invisible cat tail), Goombas, Koopas, Snappers, Cactui, and so many more loving references to Mario.
I haven't seen apps or charges.. There are at least 20 levels I played so far, and it has music unlike the first tiny robin.
This is just what I was looking for - a Mario fix on my iPhone. I used Lep's World for that, but Lep's is really it's own universe and quite commercial.
My complaints are please add MFi controller support to all your games for a more authentic experience, and I wish I could grow into a more powerful cat rather than a boy !!