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.
La Rose, la violette et le papillon La Rose, la violette et le papillon ("The Rose, the Violet, and the Butterfly") is a ballet "divertissement" in one act, with choreography by Marius Petipa, and music by Duke Peter Georgievich of Oldenburg. The libretto was by Jules Perrot.