It was very ambitious for the era. Probably too ambitious given the limitations of tech at the time.
The 6 games were all supposed to inter connect so you could go back and forth between them. There was the City, the Dungeon, the Arena, the Palace, the Wilderness, Revelation, and Destiny. And if that’s 7, that’s due to the Dungeon not even being a game originally. It was supposed to be the sewers of the city, but it ended up getting chopped into its own game.
Of course keep in mind this is before the days of having everything on a hard drive, you would have been swapping floppy disks in and out of the disk drive for all this when you moved into a different area.
Basic concept was you were a human kidnapped by some aliens and shoved you into this fantasy setting (The Alternate Reality) for their own amusement. They did this to a lot of people. Presumably some of the people you were interacting with were other prisoners.
That's sort of another thing you saw a lot more back then, a mix of scifi and fantasy elements together. The 3 major old RPGs on computers (Ultima, Wizardry and Might and Magic) all started with this type of set up so it was more common.
Anyway you were basically trying to figure out how to get out of the system and ultimately confront the aliens. Now the intro cut scene along with the song at the beginning sort of gives away the plot rather than it being a big mystery, though if you were the type to just skip intros, then yeah you might miss it.
The City game was more or less just a sandbox without much actually there. You could run around fighting things and shop for stuff, but there just wasn’t too much to do after a certain point since the other games were meant to flesh things out.
The Dungeon actually was a bit more lively in that if you wandered enough, you’d probably stumble on the major quest that you can try to complete. (There was other stuff too) Completing the main quest actually did allow you to get to the alien ship and you needed a specific item to not get vaporized instantly by the alien overseer.
Get past the overseer and you could explore deeper into the ship, but you needed to insert disk 1 of Revelation for that. So you weren’t getting much further, and it was just a sandbox at that point that you could just run around being a dungeon overlord.
The game notes implied you had several options of how you would be able to deal with your situation, either go back to earth with the rest of your fellow humans (Everyone was in a metal cocoon/brain in a jar type thing I think) get revenge on your captors by throwing them into the sim (or just killing them I guess), or just stay in the simulation and live like a god there.