Sonic Adventure X (SADX Mod) - New Level Layouts! [1080p HD] 

Sonic Adventure X is a mod for SADX that was released back in 2012 and contains 3 new level layouts for Sonic (for his first 3 levels), and other minor things such as:
A bit of a graphical change, as you can see
New music for the new levels
A new nice logo on the startup screen thingy
New entrace to Emerald Coast
Rhinotank enemy texture changed
etc (play yourself to discover the rest, idk)
Found this randomly while looking up Sonic mods. Pretty nice tbh, just wish there was more...
Decided to make this video because I couldn't really find anything else up on this in decent quality, so yeah.
Download the mod here: www.moddb.com/...
Enjoy! :D