| Clue | Source | Date |
|---|---|---|
| Metal sounds | ||
| Chain sounds | Wall Street Journal | 22 Feb 2020 |
| Chain-rattling sounds | ||
| Chain-rattling sounds | New York Times | 17 Feb 2020 |
| Metallic sounds | LA Times Daily | 30 Aug 2018 |
| Metallic sounds | ||
| Metallic sounds | ||
| Machinery sounds | ||
| Haunted house sounds | ||
| Walking-robot sounds | ||
| Chain sounds | ||
| Noises from a rattletrap | ||
| Chain sounds | ||
| Chain sounds | ||
| Chain "reactions." | ||
| Metallic sounds. |