J'ai trouvé ça pour l'instant sur Gamefaqs. Mais ne connaissant pas le jeu je suis pas sur que ça corresponde :


Here are the endings possible:

1. Meteor gets sent to outer space. CONDITION: Put the meteor in the trunk
and turn on the car.
2.The meteor is taken by the police. CONDITION: Bernard must call the
police and the door must be open.
3.Meteor becomes a writer. CONDITION: Wendy must get the manuscript
published and show it to the meteor.
4.Meteor gets eaten. CONDITION: Bring the meteor all the way to the
mutant plant and GIVE the meteor to the plant.
For some alternative endings, try killing off one or two kids before you
beat the game.

Je crois que dans cette vidéo il y a la fin que tu veux https://www.youtube.com/watch?v=wIc_Pz5K400&search=maniac%20mansion

putain y'a des fin que je connaissais pas
C simpas mais je me souvien plus comment on fait tout sa