Sir Dave- I have played all 15 ND games. My first was Message in the Haunted Mansion. I just finished playing it again for the second time. My favorites are - Blackmoor Manor, Treasure in the Royal Tower, Old clock, and Blue Moon Canyon. Of course, I love all 15 of them. As for the time limits in many of the ND games you get a second chance. I find it exciting. I just keep hitting second chance until I get it right. I think many GameBoomers are holding on to their ND games because they do play them over.
"Happiness is good health and a bad memory." Ingrid Bergman