PURRS
| Date | Clue |
|---|---|
| 2026-05-21 | Contented sounds |
| 2019-12-22 | Runs smoothly |
| 2018-12-13 | Engine sounds |
| 2016-08-30 | Sounds from a happy kitty |
| 2015-08-10 | Contented cat sounds |
| 2011-09-21 | Hums |
| 2008-09-15 | Cat sounds |
| 2005-05-10 | Engine hums |
| 1998-12-28 | Runs smoothly, as an engine |
| 1998-09-19 | Doesn't knock or ping |
| 1998-03-08 | Sounds of contentment |
| 1997-11-26 | Good engine sounds |