| 2021-09-19 | Common viper |
| 2021-07-11 | Total-itarian? |
| 2019-06-13 | Snake that's good with numbers? |
| 2018-08-18 | Summer |
| 2018-03-24 | Only poisonous snake in Britain |
| 2017-09-25 | Puff ___ (snake) |
| 2017-09-02 | Viperidae family member |
| 2016-10-09 | Member of the genus Vipera |
| 2016-07-25 | Puff ___ (snake) |
| 2016-03-22 | Puff ___ |
| 2016-01-14 | Viperidae family member |
| 2015-11-20 | Math columnist? |
| 2015-01-04 | Deadly viper |
| 2014-07-13 | One summing things up |
| 2014-06-22 | Venomous snake |
| 2013-11-09 | Hognose snake |
| 2011-10-05 | Dangerous snake |
| 2011-05-16 | Small viper |
| 2009-11-15 | Abacus user |
| 2009-04-05 | Abacus, e.g. |
| 2008-12-24 | Abacus user |
| 2006-12-12 | Abacus user |
| 2006-07-20 | Summer |
| 2005-12-07 | Abacus wielder |
| 2005-08-30 | Viper |
| 2004-12-26 | Puff ___ |
| 2003-08-10 | Viper |
| 2002-07-07 | One working on a column |
| 2002-06-21 | Office machine |
| 2002-06-17 | Venomous snake |
| 2002-04-28 | Relative of a rattlesnake |
| 2001-11-03 | One working on a column? |
| 2001-09-22 | Figurehead? |
| 2000-11-01 | Summer |
| 2000-05-17 | Viper |
| 2000-03-24 | One who does 23-Across |
| 2000-01-31 | Viper |
| 1999-03-22 | Puff snake |
| 1998-06-15 | Viper |
| 1998-01-06 | Cousin of 42-Across |
| 1997-09-29 | Viper |
| 1997-06-04 | European viper |
| 1997-05-10 | Milk snake |
| 1995-12-26 | Calculating snake? |
| 1995-04-01 | Viper |