Fron what I can tell, the SMS and Genesis versions have completely different level design, and the "remake"'s level design is completely different from either of the two. Also, it seems that the music is completely different between the versions.

For that reason, I would regard these three "versions" as entirely different games.

(In a way, it's like Castlevania, Castlevania 4, and the game remade as Castlevania Chronicles for the PS1; they have the same plot, but the level design is different.)

My list is a lot longer than that, but it's not really a list, because making plans on what to play next doesn't really work out for me. I just play what I feel like in a particular moment, and if it's the right game for that moment in time, I stick to it until I've completed it.

What about bug fixes? I'm not sure how you can argue those are not how the game is meant to be played.

Sounds like me. Whenever I finish (or give up on) a game I install a bunch of games which might click with me right now, and the first one that I spend more than an hour on is usually it.

Bug-fixes are fine (like mods that add high resolution support and stuff like that, I'm thinking about the DSFix of Durante for Dark Souls). Actually, mods with additional content are fine too, I'm just not into them :)

I actually don't like bug fix mods *unless* the mod lets me pick and choose which fixes to apply. Some bugs can actually make the game more fun, and I would rather not have them be fixed.

Also, sometimes I see working around certain bugs as part of the challenge of the game, especially if the bug can be both good and bad depending on the situation (for example, SaGa 1's saw bug that lets you kill the final boss with it, and Morrowind's Armorer bug that makes the skill more effective when you're tired).

Games I wish to complete:

GTA V.
Assassins Creed Origins.
Divinity Original Sin 2.
Dragon Age Origins.

Caesar 3
Jagged Alliance 2
Montezuma's Revenge

There is a really bad joke in there somewhere. :P

Final Fantasy V
Witcher 3
Fallout
Divine Divinity
Quest for Glory 3
Frozen Synapse
Chroma Squad
Syberia 2

I'm sure developer knew what he was doing when you gave the game that name :)

More and more prominent titles come up the more I think about it

Cyberia - I don't I like it, but those flying sections are tough as nails

Wing Commander IV - For some reason my 486 didn't want to read the final disc properly so I could never finish it.

Warcraft 2 : Beyond the Dark Portal - A crying shame that I never powered through it

Icewind Dale 2 - If I ever manage to get through BG2.

Return of the Lost Vikings - First one was a blast

Homm3 - Unlikely since I lost my saves

Caesar 3 and all the other classic Sierra City Builders - I want to finish each one with a super self-sustaining city (somehow)

Adventures of Willy Beamish - Love the setting

The entire Commander Keen series - Finished the first 3 episodes, so only 3 left to go

Jagged Alliance 2 - Have restarted this so many times.

Motezuma's Revenge - Intense nostalgia mostly, not to mention the ridiculous challenge it poses. Seriously difficult game.

The entire Larry, Police Quest(only up to 2) and Space Quest series. Not so sure about the Kings Quest series.

Thief 2 - Since I've given up on the first game and it's deadly combination of massive and convoluted level designs.

TMNT:Arcade game - The nes version. Still don't know how I managed to beat tmnt3

And finally as many of the nintendo classics possible that I missed: Zelda, Super Metroid, Mario etc.

Personally, I think that sequel was sort of bland. Both in term the story and puzzles.

I actually finished the main campaighn, but haven't finished neither of two add-ons.

And you are correct. The general quality is on the same level. But the thing is, in Lost Vikings in addition to regular puzzles there were some unique episodes. Like gravity boot in one of the space levels; Egypitan level, where you are bombarded with dozens of huge blocks at the end; a factory level, where you must fix some device with the toolset that you make from several components... In RotLV there is simply no such moments - all puzzles are made from the same elements. And on each level you have to gather three things to proceed.