[Sonic 1] Sonic Brother Trouble

So in the title itself, Sonic 1 Brother trouble is hack created by popular sonic hacker MarkeyJester in which you can play as both sonic and his brother manic from the sonic underground series. only a demo version of this was released, along with a couple of older ones as sometime ago, the hack had gotten cancelled but for those still curious in wanting to try this. you can get it here

http://info.sonicretro.org/images/9/9f/Sonic_1_Bro-Tro_v1.5_%28Beta%29.zip

Here are some screenshots of [Sonic 1] Sonic Brother Trouble:
!Spoiler Alert!

I remember playing this hack back in 2010. I don't remember those levels being playable. Guess it's time for me to scope this out later tonight.