I just beat Donkey Kong Country. And I can say without a degree of doubt that it is the hardest platformer I've played 2D or 3D. Really enjoyable; while I was playing it it felt like there were some parts that were a bit cheap, but on reflection, I think really only the the first mine cart level should be fixed. It's fairly early on for such a hard level, and I remember having to get a jump down to the micro-second, also when I got it right I wasn't entirely sure what I did differently.
Have no interest in playing the other two. Only played this one because my second cousin had it and I played it maybe a total of two times (yet the childhood frustration still is something I can recall - mine cart level in particular) because I've never been close with his side of the family. Still nice to beat though. I did the Wii version on my 3DS about a year ago and it was much easier than this.
I realized a bit ago that the two games I haven't beat yet are Rayman and Croc. But I deleted my PS One emulator and want to take a long break from retro games. I'll probably get back to it with Gex 3 if I don't buy an Xbox and focus on early 00's games. If I play anything it'll be Mega Man 7 passingly.
Also, I'll have something about short Epicurus and Stoic texts I'm reading relatively soon. I'm taking a break from the paper writing because the ideas I wanted to work on I was jazzed about months ago and I want to do something else before I return to them if I do at-all.