XFACTOR
| Date | Clue |
|---|---|
| 2025-01-25 | Certain something |
| 2020-06-13 | Je ne sais quoi |
| 2009-10-26 | Mystery quality ... or what 18- and 55-Across and 3- and 32-Down have? |
| 2009-03-13 | Hard-to-define influence |
| 2006-10-01 | Unknown |
| 2006-05-28 | Unknown element |
| 2004-05-02 | Unknown element |