Recreating a level from anything is loving impossible unless it's mario bros.
Sonic the hedgehog is a series that relies on momentum based movement which blockland cannot stimulate, so it's pretty pointless to recreate levels unless they just take the themes or styles from those level's design and gimmicks and put them into something new like a DM.
Pablo, recreating that old save may just be the hardest loving thing since it's only round bricks that are used. We could put up the names of the various (2) addons required which are the Round Corner Bricks and One Random Brick Pack.
Of course, I could just make a save that's like the old build I made but lacking in the circles.. It's a tough one. Your call, pablo.