Clue
As proof that movies based on bizarre IPs are not a new thing, 1985 saw the release of a film based on the board game Clue. Thankfully the board game has a basic plot of “murder mystery”, which the movie uses. It ends up killing a lot more than Mr. Boddy.
This movie is not “good” by any means, but it falls into the category of “a lot better than it could have been” and is perfectly fun for a time waster. Its multiple ending gimmick at least tries to be experimental and interesting (it was intended to have different theaters show different ‘definitive’ endings). And the John Morris score is underrated and excellent.