| 2026-07-28 | Skill needed to solve a sudoku puzzle |
| 2025-07-29 | "___ will get you from A to B. Imagination can take you everywhere" (statement attributed to Einstein) |
| 2022-06-03 | Puzzle genre |
| 2021-09-04 | "___ is the beginning of wisdom ... not the end": Spock |
| 2020-07-15 | What you need to solve sudoku |
| 2017-11-17 | Detective's asset |
| 2017-08-18 | Computer programmer's need |
| 2017-07-26 | KenKen solver's need |
| 2016-03-22 | Sudoku solver's need |
| 2015-06-21 | Part of an unsound argument |
| 2015-03-29 | "When dealing with people, let us remember we are not dealing with creatures of ___": Dale Carnegie |
| 2015-01-21 | Mr. Spock's forte |
| 2014-12-16 | Sound reasoning |
| 2011-12-23 | Branch of mathematics |
| 2011-05-25 | Boolean ___ |
| 2010-12-19 | Need for KenKen |
| 2009-10-20 | Mr. Spock's forte |
| 2009-09-14 | If A > B and B > C, then A > C, e.g. |
| 2007-07-31 | Sound reasoning |
| 2006-04-16 | This makes sense |
| 2005-07-26 | Means to solving a sudoku puzzle |
| 2003-01-28 | Computer programmer's need |
| 2003-01-22 | Aristotle's forte |
| 2002-04-28 | Good thinking |
| 2001-10-08 | If a = b and b = c, then a = c, e.g. |
| 2001-08-14 | Detective's skill |
| 2001-05-19 | It makes sense |
| 2001-04-23 | Common sense |
| 2000-09-18 | Mr. Spock's forte |
| 2000-06-12 | Sound thinking |
| 2000-04-09 | Line of thinking |
| 1999-11-03 | Reasoning |
| 1997-02-23 | Work done on the premises? |
| 1996-08-13 | Reasoning |
| 1996-07-26 | Aristotelian subject |
| 1995-12-27 | Subject for Aristotle |
| 1994-06-19 | Raymond Smullyan topic |