Clair Obscur: Expedition 33 is structured into 3 main acts.

More specifically, the game has:

  • A Prologue set in Lumiere before the main story begins.
  • Act 1.
  • Act 2.
  • Act 3.
  • An Epilogue , which some guides note is effectively wrapped into the conclusion of Act 3 in how the story is presented.

So if you’re asking “expedition 33 how many acts,” the widely agreed answer is three acts, plus a prologue and epilogue around them.