My cousin NVG used to find games in the bargain bin and share them with us, and Fiendish Freddy was one of those games. We played it on the 386 – the only thing I remember is the opening music of the game playing on the internal PC speaker. Good times.
One last thing to add: JC just saw this post and asked me what a Tandy was. haha. Took me a second to answer her with two words: “Radio Shack”. Good night.