Hi, all! Dee, I think you will love these games. Royal Tower and Haunted Mansion are among my favorites, but I am surprised to see The Final Scene not getting much of a mention. I liked that one even better than Haunted Mansion. I really enjoyed the music in this one and some of the puzzles were so much fun I kept the game on my harddrive long after I finished the game.
And Doug makes a good point about seeing the progression in the games. I found the earlier games somewhat frustrating due to dead ends too.
Whichever one you play next, enjoy!