The guy who made it was DJ MAX-E Feel. His new YouTube is here. You might try contacting him to see if he will provide you a copy.
I also found this Newgrounds page with a song called Wrath of Robotnik.
There is a torrent on Pirate Bay that contains a reference to a MaxieDaMan song about Sonic 2 boss. However, the torrent has no seeds whatsoever. Search for 'Secret Stage'.
Edit: Man it is NOWHERE. Try Soulseek.
Yep! You can't have a fangame thread without SRB2. The community is still somewhat active, and development is chugging along. The multiplayer has cooperative and competitive modes and it's a lot of fun. I sunk so much time into it when I was a teenager, and I still hang around on the community IRC chat to this day. Great community, great game.
What chapter are you ´cause I can´t tell where the heck you are so have this http://www.gamefaqs.com/ds/941521-sonic-chronicles-the-dark-brotherhood/faqs/54316 And yes, the game has its moments. After a while it gets far too easy though and true challenge comes far too late in the game and lacks in quantity. Also the music is Egh! From a Sonic game I do expect better sound tracks. If you want to play amazing Sonic DS games I recommend Sonic Rush and Rush Adventure.
I wanted to add it to my newsfeed reader, then I noticed it does not have any RSS or Atom feed, so my reader can't read it.
If you don't update the comic anymore, you can even manually write a static XML file and put it somewhere.
Check around holidays cause Amazon has them digitally for the same price the print editions (and I think you can get the physical copies too) so they may go on sale and there's like a week in the summer where most are on sale
You mean this?
Fraid not. Not seeing anything on E-Bay either.