SB1: the base game
SB2: some improvements
SB3: very limited amount of changes/additions
SBZ: A Reskin? I dont even remember anymore what it improved or did.
SBPR: They tried... tried... garbage performance, limited gameplay and interactions, just weird.
Sexy Beach is originally created as a parody of DOA's Extreme Beach Volleyball, the full-fledge hentai version of it. This game is one of the earlier hit of Illusions games besides the Bikou series back in the day. SB3 is the peak with the most feature and interactions.
SB Zero is supposed to be the restart of the series with overhauled graphics but it comes with many problems especially with the new real-time shader and slow performance.
SB Premium Resort are another attempt from Illusion to restart the series. Notable things about this game is Illusion tried to incorporate open world to the Sexy Beach series. The problem is the open world attempt actually degrade the overall enjoyment of the games. Because of the complexity of the world, the interaction with the girls is severely limited compared to SB3 even though there's many scripted event. The girls feel more alive with SB3 even though it's technically inferior.
AG1: Never played that
AG2: same
AG3: many of us remember it positively, but technically it still was a very barebones game with limited gameplay.
AIS aka "AG4": Actually not that bad, but unnecessarily limited and performance was screwed until we unscrewed it with mods. They at least tried to improve and add new things.
Jinkou Shoujo/AG 1 is really revolutionary game at the time. The only open world real time 3D hentai game with character customization and trait simulation element. Everyone is at an awe.
The AG2 improves on that BIGLY, so many feature added without bogging down the game (runs great even with bad PC).
AG3 is the best AG with much bigger map, story and interactions. I can't count how many hours I sunk playing AG2&3. AG3 is also, I think the first time the western modders scenes exploded and added so many things. Before that we only have limited mods from Japanese modders (uppervolta's goodness).
AG is the face of Illusion Software for so many years so when AI Shoujo released many people were disappointed with its horrible performance that takes the fun out of the game (not even counting how limited the interaction with the girls compared to the AG3). Illusion clearly have insurmountable technical problem handling modern 3D programs, which I think because of their difficulty of recruiting excellent coder/programmer.
KK: If they had combined that and AA2, we would have actually had an interesting game, but they didnt, pretty much another "as little as we get away with" game.
Emotion Creators: what was this supposed to be, flopped hard afaik.
KKS: A sidegrade to KK, in some areas even a step back, but it got a new UI and improvements to the talking interaction, that make $60 then, thanks.
As I said before, Jinkou Gakuen is already "perfect" with the simulation, so when Koikatsu is out, some people are disappointed at how "basic" the interaction is. Everything is lovey-dovey, vanilla and boring. No conflict, no jealousy, no fight, no murder. BUT this game SELLS. This series maybe the biggest hit title Illusion has. I agree that KK should have been combined with AA2, or for me I hoped that KK is the modern version of AA. But it's not. As a long time Illusion fans KK is the only series I really hate.
Real Kanojo: Very limited, but at least it was something new at that time.
This one is really "innovative" in the sense they tried to realize GFE (girl friend experience) through a series of real time event. But then as usual they stumble with tech difficulty and can't really achieved that. I applaud Illusion to go to the new frontier, even though this one is a flop. Too bad they kill this IP.
Premium Play Darkness: The first iteration of the "scene selectors", which we got a lot of.
Real Play: the 2nd one of those
Play Club: 3rd one
Play Home: 4th (the last one that had the interactive position-square at the bottom right, I still miss that in the newer games.)
Honey Select 1: 5th
Honey Select 2: 6th
All of that game is the evolution and derivative of Interact Play VR, Bikou series and Rapelay. All of the games with "Play" names is the anagram of Rape in Japanese (Play: Purei / Rape: Reipu). The difference is the IPVR, Bikou and Rapelay actually have real-time stealth stalking gameplay element, while the newer games completely removed that and just leave training and scene selector element. I think with the strengthening of stalking law in Japan, Illusion doesn't want its game to be used as incriminating evidence of criminal activity in the court of law LOL.
Honey select series even tone down more of its "dark root" and became 100% pure & vanilla.
Room Girl: Actually a great Idea, if they hadnt watered it down to the absolute bare minimum and then screwed up performance while also using IL2CPP which makes fixing the game very hard in the beginning and people lost interest.
Yep ironically this is the best game of Illusion of the recent years. They go back to their roots of close and intimate interaction of girls, with gorgeous customizable face, body and clothing. Too bad they hampered it down with zoning system. Imagine if they takes more time with this game and make this open world, ala Koikatsu, I'm sure they will have another big hits and doesn't have to close shop. But oh well.
Illusion always did that and never was good at "improving".
......
As it turns out, illusion never was good at innovating. Koikatsu is probably the result of them swallowing TEATIME, and the other games (with some outliers) are "meh" at best, but they made the dick hard, so they could sell plenty of them even though there were almost no improvements.
I do not expect anything from the first game of "new.illusion" (or whatever they will call themselves) because this game still was made under old.illusion lead, unless they did split shortly after Room Girl came out. I think that the patches, DLCs and next game after this one will show what has changed, if anything has changed.
For me I think, Illusion is the best at "
innovating", creating something new, opening new frontier, but they are the worst at "
optimizing" their games, making their game feels "incomplete" and not cohesive. They have MANY IPs that span different genre and gameplay, but every time a new game launches, something feels off, incomplete and riddled with tech difficulties. That's why the Illusion grief circles is born.