Photo Development Puzzle (Floor 1 Film School)

The photo development puzzle is a 12-step craft that turns a photo roll into a Photo, which unlocks the Hexagonal Stone. Each step uses a specific item on a specific location; missing one step blocks the next.

1. Pick up the Photo Roll from the Floor 1 theater lobby.
2. After defeating Fumus, use the red Pentacle Stone on the Floor 3 Iván apartment bathroom door to get Chemicals.
3. Grab the Lightbulb from the lamp in the left corner of the photo developing room.
4. On Floor 1 apartment dining room, take the right-most door to the staircase, top of stairs (use the Cold Chisel if boarded), push the bookcase aside to enter, and use the Lightbulb on the bloody table to get the Red Lightbulb; survive the cutscene ambush afterwards.
5. Return to the photo developing room and use the Red Lightbulb on the lamp.
6. Use Chemicals on the trays above the lamp.
7. On the northernmost center table, use the Photo Roll.
8. On the left table, use the Negative.
9. Use Photo Paper immediately after to make a Printed Photo.
10. Back at the chemical trays, use the Printed Photo; a cutscene triggers and you receive the Photo item.
11. On Floor 3, use the Photo on the framed table in Iván's bedroom to unlock the drawer.
12. Take the Hexagonal Stone from the drawer; back in the Film School on Floor 2, speak with Sanguis against the wall, exhaust dialog, and use the Hexagonal Stone on the locked symbol door to progress.

The Hexagonal Stone opens the Floor 2 film school symbol door that progresses the main route. The Cold Chisel is gated by the third film canister; the Pentacle Stone drops from Fumus. The full chain sits inside the full walkthrough; the Cold Chisel is on the film canisters page; the Pentacle Stone chain is on the Fumus fight page.