I think this might have been from the mid 80's. Not sure. I only caught a few minutes of it on TV maybe around 1989.
It was a film about some kid obsessed with Advanced Dungeons and Dragons. I recall his folks were trying to get him to quit. The scene that sticks out in my head is that the guy is sitting in his bedroom and I think looks at his feet and poking out from under his bed is The Dungeon Masters Guide. (along with spooky music)
I am almost think it was like an after school special or something to that affect. It was not the film "Mazes and Monsters."
Could it be Skullduggery?
http://www.canuxploitation.com/review/skullduggery.html
It doesn't sound like it. From what I recall it did not have horror aspects, it was played out more like a drama almost like a film about someone with alcoholism or drug addiction.
Sounds like Mazes and Monsters
http://www.imdb.com/title/tt0084314/ (http://www.imdb.com/title/tt0084314/)
If it's not Mazes and Monsters then it's probably one of those After School Specials.
Have you tried googling for info?
ok. I think I found it. I think it might be "Cruel Doubt" 1992.
this one is solved.