Each point is one game's rating·dashed lines show each series' overall trend
Games on the chart (17)
 Akalabeth: World of Doom | Jun 30, 1979 | Main Game | – | 48 | 48 |
 Ultima | Jun 1, 1981 | Main Game | – | 64 | 64 |
 Ultima II: The Revenge of the Enchantress | Aug 24, 1982 | Main Game | – | 56 | 56 |
 Ultima III: Exodus | Aug 23, 1983 | Main Game | – | 51 | 51 |
| Ultima IV: Quest of the Avatar | Nov 1, 1985 | Main Game | – | 88 | 88 |
 Ultima V: Warriors of Destiny | Mar 1, 1988 | Main Game | – | 80 | 80 |
 Ultima VI: The False Prophet | Jun 1, 1990 | Main Game | – | 84 | 84 |
 Worlds of Ultima: The Savage Empire | Dec 31, 1990 | Main Game | – | 66 | 66 |
 Ultima: Worlds of Adventure 2 - Martian Dreams | Sep 30, 1991 | Main Game | – | 55 | 55 |
 Ultima: Runes of Virtue | Dec 14, 1991 | Main Game | – | 60 | 60 |
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