Lemmings itself was obviously a stone-cold classic. The expansion packs (for DLC requires that you be able to download, and that wasn’t really a thing for home computers, yet) Oh No! and Xmas, suffered from being a bit half-baked IMHO. They had some absurdly trivial ‘easy’ levels, which are hardly worth your time, and then followed it up with some absurdly hard levels all the way through to the end. The best base-game levels required a bit of insight on how to solve them, a bit of technical skill on executing that solution, and perhaps a little bit of luck sometimes. The expansion pack level pushed that too far to the right; some skill and a lot of luck. Takes the fun out of it.