| Clue | Source | Date |
|---|---|---|
| Unexpected classroom announcement ... and, initially, one hiding in each set of puzzle circles | LA Times Daily | 29 Oct 2018 |
| Unexpected classroom announcement ... and, initially, one hiding in each set of puzzle circles | The Washington Post | 29 Oct 2018 |
| Unexpected classroom announcement ... and, initially, one hiding in each set of puzzle circles |