KOAN
| Date | Clue |
|---|---|
| 2026-06-28 | Riddle in Zen Buddhism |
| 2025-10-24 | Zen riddle |
| 2019-10-26 | Riddle in Zen Buddhism |
| 2017-03-26 | Zen master's query |
| 2015-04-19 | Aid to Zen meditation |
| 2014-04-27 | Paradox to be meditated on |
| 2010-02-14 | "What is the sound of one hand clapping?," say |
| 2006-04-20 | Zen question |
| 2002-03-29 | Zen master's question |
| 2001-03-21 | Zen riddle |