KOTO
| Date | Clue |
|---|---|
| 2023-11-25 | Japanese zither |
| 2013-11-02 | One may be played by a geisha |
| 2011-12-25 | Japanese stringed instrument |
| 2005-02-03 | 13-stringed Japanese zither |
| 2001-07-15 | Japanese stringed instrument |
| 1999-05-11 | Japanese zither |
| 1995-06-11 | Instrument with 13 strings |