evil poster that was also a game?

when I was a teen, in the early to mid 80's I found this poster that was full of devils and demons and all sorts of evil stuff, it was crammed and it was all really small, it was a very "busy" poster. when I got it home and hung it up I noticed in the border that it had some information that it was also a game, like a board game, and to play it you had to order the rest of it via mail order. I never ordered the rest of it but I am absolutely obsessed with trying to identify this poster. can anybody help me? does anybody have a clue what I am talking about? (yes I am crazy but that is actually irrelevant in this case) jh