User blog comment:Admiral Leviathan/The Invasion Pt. 10/@comment-11644326-20100510215254

By now most of the Sonic 4 Soundtrack has been leaked onto the internet, which gave me a chance to see what we were in for. The individual level music sounds similar to earlier levels. . . (I.E. Casino Street sounds like Casino Night from Sonic 2)

. . . as well as how level design is similar to earlier levels. (I.E. Mad Gear is almost an EXACT copy of Metropolis Zone from Sonic 2)

But I'm going to hold my tongue because it has SUPER SONIC playable beyond the Final Boss like I said earlier! *Mouth starts to water*