iunno i think there's absolutely some merit in localized accents for virtue of representation -- at least from what i'm aware of dq's scottish dialogue is some of the only relatively accurate usage of it in gaming in general. not exactly minority rep but i appreciate the recognition of that as being a thing.

also bdsp aren't really the same game as platinum and while i wholly agree that playing platinum instead of any other sinnoh game is the right play 100% of the time, if i'm specifically looking to not play platinum i'd still rather play bdsp for them being more streamlined and quick feeling than dp even if they look like dogshit

i don't think i've ever seen mario 64 ds be considered a replacement before but i'll believe it. that one's especially weird cause it's probably got the most readily accessible original game out of anything on this list by a pretty wide margin. helps that the game is so short that the incentive to go try the original is practically baked into it if someone likes it enough

@Limp_Mantis no prob! It played a factor in me trying the game originally so I couldn't forget, ha.

Another demo that comes to mind is one that I'd gotten a physical copy of not long ago, that being Pokemon Mystery Dungeon: Red Rescue Team. There was a store kiosk demo with its own slightly altered 'demo' logo and a condensed version of the intro sequence, with the player playing as a Pikachu by default with a Charmander partner -- no personality quiz to determine your starter. You immediately help Caterpie in the first mission with no story pretense given, and all post-mission dialogue is truncated (at least from the first two story missions). The formation of your rescue team is also presumed and the team is pre-named as I recall. The core gameplay is identical, down to the tutorials all being the same. However, the 10-minute time limit on the demo makes it next to impossible to get past the third dungeon. I seem to remember recruitment not being possible in the demo and there being no opportunities given to explore the hub town, so it's possible that the game is more altered in gameplay than I thought rather than just the writing being shortened or removed. I don't believe further research has been done on this one, sadly.

Another demo from my youth was the Kellogg's PC demo disc for Spider-Man (2000) you could get from cereal box promotions. That one's got the full first three levels of the game playable in full with no gameplay alterations; however, there are a number of interesting little cosmetic details unique to it and even a small fix. As the demo was released in an effort to promote the Spider-Man movie that wasn't yet out when the game first released, some promo materials were added in. Billboards had the movie's logo plastered onto them (or product placement like "got milk?" if not that), and Spidey's suit texture was altered in gameplay to look much closer to the Raimi suit. The demo also has a splash screen showing the cover artwork for the movie, with an screen advertising the movie's tie-in game once the demo gameplay is finished. The beginning of each level is missing the comic book cover artwork that preceded them in the full release, and the intro FMV along with Stan Lee's opening narration are both removed too. The main menu also only allows the player to select "New Game"/"Options"/"Quit", with the various bonus options like Training and the Gallery being unselectable. After doing a little bit of research on this one, it seems that in-engine cutscenes have been fixed to run at 30 FPS in the demo; they were originally programmed to work at 25 FPS in the full game and thus didn't work properly. This would suggest that a couple weird cutscene-gameplay-transition quirks from other releases would have been fixed in this version alone... if it allowed you to play past the third level, that is.

There was an official Flash demo for 999: Nine Hours, Nine Persons, Nine Doors on Aksys' website back around the game's release. It spanned the first escape room and featured a slightly different beginning where Akane appears from the very beginning instead of Junpei being alone like the actual game; Akane's early appearance allows for some unique dialogue when interacting with objects in the room. The room's puzzles are otherwise completely identical to the main game, down to lock combinations. Really cool little piece of promo material honestly

Should also state there is like a huge gap between New Vegas and the rest of these entries that a list like this can't really quantify properly

@indicamint No, I just really don't like the gameplay of old Fallout.