Which opera, if any,  Venus and Adonis or Bluebeard's Castle has more acts ?
Venus and Adonis (opera) Venus and Adonis is an opera in three acts and a prologue by the English Baroque composer John Blow, composed in about 1683. It was written for the court of King Charles II at either London or Windsor. It is considered by some to be either a semi-opera or a masque, but "The New Grove" names it as the earliest known English opera.
Énée et Lavinie (Dauvergne) Énée et Lavinie ("Aeneas and Lavinia") is an opera by the French composer Antoine Dauvergne, first performed at the Académie Royale de Musique (the Paris Opéra) on 14 February 1758. It takes the form of a "tragédie lyrique" in five acts.