I just played demo 147 (I think) of ZGC, and...it was the most entertaining ROM hack I've played in a while. I got up to the end of World 6 (or "World 4"). I more or less gave up on trying to find the last switch, but still...almost 6 worlds is longer than I usually last with SMW hacks. (Yeah, people, I liked a hack full of cutoff, blatant level edits, and graphical glitches better than most of your fancier, nicer stuff. What does that tell you?) Makes me want to design a similar joke hack with similar craziness, but chocolate (or more so, with custom graphics, ASM, and the like).
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I'm working on a hack! Check it out
here. Progress: 64/95 levels.