That's literally all it was.. An enhanced version of Sonic 3&k mixed with CD... Amazing throwback though. Loving it.
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Kioku
Xiphiidae
Though I am enjoying Mania, I'm finding it very difficult to justify its price considering that it delivers less content than Megamix (and most of Mania's is simply rehashed old content), which is, of course, free. To me it feels almost like charging >$25AUD for a romhack (though a good romhack nonetheless).
MadMageKefka
To be fair it had stages from Sonic 1 & 2 as well as 5 original stages.