If it was made by Sierra, then according to wiki, that leaves us only 5 candidates:
- Castle of Dr Brain
- Jones in the Fast Lane
- Mixed-Up Mother Goose
- The Dagger of Amon Ra
- Island of Dr Brain
Since we're discussing adventure games, I doubt it could be anything except "Laura Bow 2: The Dagger of Amon Ra".
So let's make this official: are you somewhere in "Laura Bow 2: The Dagger of Amon Ra"?
(There's a bit of sleuthing I never thought I'd do at 7:30 am.