RIGOR
| Date | Clue |
|---|---|
| 2026-07-21 | Severity |
| 2026-07-06 | Intellectual thoroughness |
| 2024-07-01 | Opposite of laxness |
| 2018-10-02 | Severity |
| 2018-08-12 | Difficulty |
| 2016-04-10 | Attention to detail |
| 2015-07-29 | Extreme hardship |
| 2014-03-06 | Strictness |
| 2013-11-11 | Severity |
| 2012-07-30 | Severity |
| 2011-12-27 | Harshness |
| 2010-10-27 | Stiffness |
| 2007-09-19 | Ordeal's quality |
| 2007-02-25 | Harshness |
| 2005-11-28 | Severity |
| 2005-08-28 | Severity |
| 2005-07-12 | Lack of laxness |
| 2005-07-06 | Stiffness |
| 2003-02-16 | Severity |
| 2001-05-11 | Asperity |
| 2001-04-01 | Austerity |
| 2001-03-10 | Inexorability |
| 2000-10-30 | Boot camp experience |
| 2000-05-07 | Hardship |
| 2000-03-08 | Demanding standard |
| 1999-12-06 | Hardship |
| 1999-04-03 | Asperity |
| 1998-03-02 | Discipline |
| 1998-02-09 | Severity |
| 1997-11-15 | Strictness |
| 1997-06-29 | Hardship |
| 1997-06-15 | Exactitude |
| 1996-11-18 | Hardship |
| 1996-05-20 | Hardship |
| 1995-02-13 | Harshness |
| 1994-12-07 | Severity |
| 1994-12-03 | Asperity |
| 1994-10-14 | Stringency |
| 1994-08-28 | Exactitude |
| 1994-02-16 | Inflexibility |