Each point is one game's rating·dashed lines show each series' overall trend
Games on the chart (6)
| Who Wants to Be a Millionaire | Nov 23, 1999 | Main Game | 60 | 74 | 67 |
 Who Wants to Be a Millionaire: 2nd Edition | Jun 20, 2000 | Main Game | 30 | – | 30 |
| Who Wants to Be a Millionaire: 3rd Edition | Jul 11, 2001 | Main Game | – | 48 | 48 |
 Who Wants to Be a Millionaire: 1st Edition | Nov 2, 2007 | Main Game | – | 41 | 41 |
 Who Wants to Be a Millionaire | Sep 17, 2010 | Main Game | 0 | – | 0 |
| Who Wants to Be a Millionaire | Oct 29, 2020 | Main Game | 58 | 57 | 58 |