First film based on a boardgame

The comedy whodunnit Clue (USA, 1985) was based on the boardgame Cluedo. It starred Tim Curry (UK) as the butler, Wadsworth, aiming to finger the killer of his employer, Mr Boddy. The six suspects are all characters from the game: Mrs Peacock (Eileen Brennan, USA), Mrs White (Madeline Kahn, USA), Professor Plum (Christopher Lloyd, USA), Mr Green (Michael McKean, USA), Colonel Mustard (Martin Mull, USA) and Miss Scarlet (Lesley Ann Warren, USA). Three different endings were filmed, and a different one shown at different theatres.