It's a learning game for children for the Sega Pico and I'm just playing it at the moment. Don't laugh at me! I've just started collecting Sega Pico stuff, I think this is a quite interesting console, but they should not have aimed it at children only. And you can draw it with it, whenever there's a feature like that in a game, I have to use it quite often.
I like the colour swaps of the Green Hill Zone, especially the purple one. So I have drawn it in my own style.