ENIGMAS
| Date | Clue |
|---|---|
| 2024-10-04 | Inscrutable sorts |
| 2024-04-11 | Head-scratchers |
| 2024-03-29 | Great mysteries |
| 2021-03-03 | Mysteries |
| 2017-07-05 | Puzzlements |
| 2013-10-14 | Mysteries |
| 2013-05-31 | Causes of head-scratching |
| 2012-04-13 | They're hard to figure out |
| 2009-10-27 | Riddles |
| 2007-02-15 | Knots |
| 2003-12-28 | W.W. II code machines |
| 2002-05-14 | Riddles |
| 2001-10-21 | Mysteries |
| 2001-04-28 | Posers |
| 1998-12-23 | Mysteries |
| 1997-07-01 | Riddles |
| 1995-05-29 | Posers |