Rosella of King's Quest IV makes a cameo appearance in Leisure Suit Larry 2: Looking for Love (In Several Wrong Places). She can be found tending the barbershop in the airport. In game when you type "look girl" it responds with:
"You find Daventry Women Sexy. (But then you find any woman sexy!)" followed up with the question, "By the way, have you played 'King's Quest IV' yet?Indeed, it is you Rosella. It is you. :)
At the time of its release (and according to the box) this was the largest game ever made. Over 3 megabytes of code! The new graphics started a trend with the Sierra games of the late 80s and early 90s that would test the limits of how many disks can be crammed into a box... until CD-ROM became standard.
If you type in some vulgar words, the game will respond "Perhaps you should purchase a copy of Leisure Suit Larry instead?"
If you go into fresh water and type "drink piss", Rosella will say "Ahhhhhh! It tastes good!".
The big deal with this game when it came out was that it incorporated stereo music support for sound cards. The composer, William Goldstein, also wrote the music for the musical Fame. Another big deal back then was the inclusion of a female protagonist.
If you asked Rosella to "undress", she refused by replying that children might be playing the game.
King's Quest 4 began development right around the time Sierra wanted to go with a new game engine, so KQ4 was developed simultaneously in both game engines--the new one (SCI) so that they could work the kinks out, and the old one (AGI) so that they could still release a product if any major setbacks occured with SCI. No such problems occured, and King's Quest 4 was released in two versions: The AGI version which traditional 160x200 graphics and only requiring 256k of RAM, and the new SCI version with 320x200 graphics, but requiring 512K of RAM.
The older version is extremely hard to come by--it had a very limited release.