MANMADE
| Date | Clue |
|---|---|
| 2022-11-29 | Artificial |
| 2016-06-22 | Like Lake Mead |
| 2015-02-15 | Like Lake Mead or Lake Powell |
| 2014-04-18 | Artificial |
| 2011-09-04 | Unnatural |
| 2010-11-15 | Not natural |
| 2001-04-28 | Like Lake Mead |
| 1995-10-08 | Synthetic |
| 1994-08-19 | Artificial |
| 1994-03-05 | Unnatural |