Each point is one game's rating·dashed lines show each series' overall trend
Games on the chart (10)
 Akalabeth: World of Doom | Jun 30, 1979 | Main Game | – | 48 | 48 |
 Ultima | Jun 1, 1981 | Main Game | – | 64 | 64 |
| Ultima IV: Quest of the Avatar | Nov 1, 1985 | Main Game | – | 88 | 88 |
 Ultima: Runes of Virtue | Dec 14, 1991 | Main Game | – | 60 | 60 |
 Ultima Underworld: The Stygian Abyss | Mar 11, 1992 | Main Game | – | 83 | 83 |
| Ultima VII: The Black Gate | Apr 16, 1992 | Main Game | – | 90 | 90 |
 Ultima VII: Part Two - Serpent Isle | Mar 25, 1993 | Main Game | – | 79 | 79 |
| Ultima Online | Sep 24, 1997 | Main Game | 67 | 96 | 81 |
 Ultima IX: Ascension | Nov 24, 1999 | Main Game | 50 | 75 | 62 |
 Shroud of the Avatar: Forsaken Virtues | Mar 27, 2018 | Main Game | – | 45 | 45 |