Match the exact unit
This is guide unit 15: Chapter 3 Cognito, Hall Puzzle. Confirm the screenshot before copying a symbol, dial or slider state.
Solution cross-checkedBoxes Lost Fragments Chapter 3 Hall Puzzle · verified 2026-09-30
Boxes Lost Fragments Chapter 3 Hall Puzzle solution
Use the piano key, film reel, mechanism and remote to project the fireplace pattern and reach Chapter 4.
Quick route: Follow the four mechanism phases below in order; the exact video segment begins at 72:09.
Step-by-step walkthrough
Open the first layer
Fit the piano key; press the second-last key three times and the first key four times to align all three numeral markers.
State and version notes
- Confirm the chapter, unit label and screenshot together before copying a visual state.
- Inventory objects often unfold or hide a second switch; inspect every side before assuming an item is unusable.
- This route was checked against two complete written walkthroughs and the matching full-game video segment.
Checked against the matching Just Adventure section, the complete Walkthrough King route, and the full-game video at this unit's timestamp.
EXACT SEGMENT
The clip starts at 72:09 and ends before the next named box or hall puzzle.
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