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Interactive movie
Hi there, 
I'm willing to make an interactive movie with Unity. Do you think Adventure Creator suits well with that kind of "game" ?
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Welcome to the community, @Dunnbar.
It's certainly not unheard of - this game, for example, is of an FMV-style.
AC's Engine: Play movie clip Action can be used to control playback of any video asset that Unity supports via its own Video Player component.
The exact workflow would depend on your game, but generally this kind of game can be made by playing videos, then giving the Player a choice, or showing an interactive 2D scene (perhaps using photographic elements taken from the video), before showing more video(s) while recording those choices made.