Another book I read as a teenager. This was a schlock, sensational novel written back when Dungeons & Dragons (and the associated mania surrounding it) was just becoming a big thing. The protagonist is a teenager obsessed with a D&D-style roleplaying game, to the point that he over-identifies with his character. The plot is almost like Jack Chick's "Dark Dungeons," minus the Christianity... and the humor.
Despite that, I gave it 2 stars instead of the 1 it probably deserves because I do remember enjoying it (though even as a teenager I recognized that it was a pretty crappy novel). Also, the one thing the writer did do well was preserve the mystery about the "hobgoblins" -- I didn't know until the very end whether or not we were actually going to see supernatural creatures.