Before I ran across this ad recently, I didn't remember ever hearing of Mansion of Hidden Souls. As a point and click adventure, it isn't really one of my favorite type of games.
Mansion of Hidden Souls actually got mostly positive reviews. I'm not sure that this ridiculous ad from the February/March 1994 issue of Sega Visions did anything to sell more games though. The plot involves a girl who chases a butterfly into a mansion and gets trapped. You, as her brother, must rescue her.
This game was released late in 1993 and apparently it was successful enough to spawn a remake on the Sega Saturn which was released in 1995. Unfortunately, the Saturn version was not as highly regarded.
Read more: https://megalextoria.blogspot.com/2018/02/mansion-of-hidden-souls-sega-cd.html