KNOTTY
| Date | Clue |
|---|---|
| 2025-03-18 | Extremely complicated, as a problem |
| 2021-04-03 | Tough |
| 2015-05-06 | Difficult |
| 2014-08-01 | Tough to figure out |
| 2012-01-09 | Gnarled, as a tree trunk |
| 2011-09-04 | Labyrinthine |
| 2010-04-14 | Full of difficulties |
| 2007-03-03 | Intricate |
| 2002-10-24 | Stubborn, as a problem |
| 2000-03-26 | Problematic |
| 2000-03-06 | Hard to saw, as some pine |
| 1995-04-06 | Complex |