This is the Sonic the hedgehog mod.
It adds a couple of things. I uhhhhhhhhhhhhhhh.
I wont list out everything. sry. but after downloading the mod, you'll see that some block/item descriptions say what they do.
anyway, have fun with this mod!
So uhhhhhhhhhhh. Yeah. Theres a couple of items/blocks. theres a biome. and.... yeah.