Entertaining slapstick - please do not take it seriously

This is about the fun of Deathtrap ("Who Dunnit") and the bizarre and silly way not only the case itself but also the solution (?) Will be presented, is always to be understood with a certain twinkle in his eye. In this film adaptation of a popular board game genre thriller is neatly pulled through the mud, but that offer what a classic thriller from Christie, Sayers offers so: a completed scene, a group of people who have all their secrets, everyone is suspicious, everyone has motive and opportunity, nothing is as it seems - and you realize how much fun it the actors (especially Tim Curry, lovely!) must have made to play this joke. So, ran to the game board, neatly determined by the secret passage from X to Y, think twice, each suspect - and then present the solution: Colonel von Gatow with the pipe wrench in the library. Or not? Clue? Do!