This is another hack by Lone Devil, in which you take control of Kirby once again, this time in Sonic 2.
Read more: http://info.sonicretro.org/Kirby_in_S...
Note that Emerald Hill Zone takes up the first 19 minutes of the video because I decided to collect all the seven Chaos Emeralds in a row, to unlock Super Kirby early. Yes, there are 8 lamp posts between EHZ1 and EHZ2, there's even one to spare.
There is no Sky Chase, but there is Hidden Palace.