"Photograph's big secret is that it's not a puzzle game. It's five puzzle games.
The game is divided into five distinct stories, set in five different times and locations, A player will learn how to solve progressively difficult puzzles in one story, and then move to the next story which has completely different gameplay.
That's important because Photograph's other big secret is that it's not a puzzle game, it's a narrative game. The dioramas, the photographs, the sound, the voices, and the puzzles, come together to create a cohesive narrative experience that tells that specific story.