Here's a cool concept!
A Green Hill you can build! This is a possible set that Lego might release. There are lots of build-able Sonic details, but it seems like the boss is the star of the show. You can see here a loop, the iconic palm tree and sun flower, a ring, Moto Bug badnick, 2 small flowers and 2 different types of egg-robos. (Top hat & gun-having) There's also a monitor power up & you can count 3 Flicky birds. Sonic is there with...I guess maybe that's supposed to be an emerald but its like some wierd polygon mashed thing.

The boss is the final one from Sonic 2, the Egg-mecha type thing with the spike hands that made it very hard to hit as it stomped aorund. Because it seems scaled to the lego-man Sonic figure it's actually the largest thing in the set. (Interesting) Hopefully this is something that gets made! (And hopefully they fix the item Sonic is holding & include more rings...) This entry will be updated if it gets made.