| UFO: Alien Invasion (2006) | 13,075,678 | 427 |
| UFO: Enemy Unknown (1994) | 1,175,553 | 1,868 |
| UFO: Extraterrestrials (2007) | 560,840 | 746 |
| Ufouria: The Saga (1991) | 893,624 | 884 |
| Ugaris - The legend Recovered (2014) | 331 | 3 |
| Ugh! (1992) | 89,053,293 | 1,478 |
| The Ugly Ducling (2022) | 0 | 0 |
| Ugly Mansion (2026) | 0 | 0 |
| The Ugly Prince Duckling (2007) | 5,656 | 20 |
| UglyDolls: An Imperfect Adventure (2019) | 380,098 | 106 |
| Ugougo Trinity (2009) | 0 | 0 |
| UK Truck Simulator (2010) | 2,819,500 | 331 |
| Ukhar (2018) | 1,310 | 6 |
| UKNON Jones & Guynelk - Awesome! (2023) | 86 | 1 |
| UKNON Jones & Guynelk 2 (2025) | 0 | 0 |
| Ukraine War Stories (2022) | 35,404 | 113 |
| Ukrainian Shield: Iraq (2025) | 0 | 0 |
| Ulama: Arena of the Gods (2017) | 337 | 7 |
| Ulia Chronicles (2024) | 417 | 2 |
| Uligo: A Slime's Hike (2022) | 358 | 9 |
| Ulises (1989) | 110,352 | 66 |
| Ultima Adventum (2021) | 42 | 1 |
| Ultima Forever: Quest for the Avatar (2013) | 675,241 | 85 |
| Ultima I: The First Age of Darkness (1981) | 6,274,218 | 1,187 |
| Ultima II: The Revenge of the Enchantress (1982) | 2,574,165 | 571 |
| Ultima III: Exodus (1983) | 2,548,760 | 1,484 |
| Ultima IV: Quest of the Avatar (1985) | 3,342,752 | 2,604 |
| Ultima IX: Ascension (1999) | 4,378,621 | 2,340 |
| Ultima Online (1997) | 27,979,771 | 26,653 |
| Ultima Ratio Regum (2012) | 45,908 | 15 |
| Ultima Underworld II: Labyrinth of Worlds (1993) | 2,219,383 | 1,247 |
| Ultima Underworld: The Stygian Abyss (1992) | 5,668,919 | 2,297 |
| Ultima V: Warriors of Destiny (1988) | 1,997,186 | 1,626 |
| Ultima VI: The False Prophet (1990) | 3,058,645 | 2,003 |
| Ultima VII Part Two: Serpent Isle (1993) | 287,833 | 677 |
| Ultima VII: The Black Gate (1992) | 8,533,629 | 3,016 |
| Ultima VIII: Pagan (1994) | 3,033,206 | 1,226 |
| Ultima: Escape from Mt. Drash (1983) | 48,794 | 35 |
| Ultima: Runes of Virtue (1992) | 1,105,794 | 75 |
| Ultima: Runes of Virtue II (1993) | 66,745 | 151 |
| Ultima: Worlds of Adventure 2: Martian Dreams (1991) | 95,199 | 199 |
| The Ultimate 11: SNK Football Championship (1996) | 461,342 | 227 |
| Ultimate 8 Ball (1999) | 68,850 | 94 |
| Ultimate Admiral: Age of Sail (2021) | 3,816,853 | 1,884 |
| Ultimate Admiral: Dreadnoughts (2021) | 42,965,834 | 12,017 |
| Ultimate ADOM - Caverns of Chaos (2021) | 575,647 | 328 |
| Ultimate Air Combat (1992) | 81,756 | 115 |
| Ultimate Angler (2015) | 1,679,810 | 353 |
| Ultimate Anime Jigsaw Puzzle (2023) | 2,280 | 14 |
| Ultimate Arena (2016) | 3,221,607 | 436 |
| Ultimate Band (2008) | 262,471 | 219 |
| Ultimate Baseball Online (2003) | 11,252 | 6 |
| Ultimate Basketball (1990) | 2,247,250 | 359 |
| The Ultimate Battle of the Sexes (2010) | 2,265 | 24 |
| Ultimate Battle Zombies (2012) | 16,387 | 1 |
| Ultimate Beach Soccer (2003) | 2,329,670 | 87 |
| Ultimate Block Party (2004) | 30,150 | 36 |
| Ultimate Board Game Collection (2006) | 41,694 | 62 |
| Ultimate Body Blows (1994) | 57,297 | 51 |
| Ultimate Brain Games (2003) | 148,615 | 72 |
| Ultimate Card Games (2004) | 13,026 | 32 |
| Ultimate Chicken Horse (2016) | 1,175,434,446 | 32,121 |
| Ultimate Chump (2024) | 3 | 1 |
| Ultimate Civil War Battles: Robert E. Lee vs. Ulysses S. Grant (2003) | 260,725 | 4 |
| Ultimate Combat Mission (1987) | 2,632 | 13 |
| Ultimate Custom Night (2018) | 2,149,405,317 | 62,720 |
| Ultimate Danger Bundle (2018) | 40,601 | 3 |
| Ultimate Destruction Simulator (2023) | 82,972 | 19 |
| Ultimate Dinos World (2020) | 0 | 0 |
| Ultimate Domain (1993) | 68,603 | 50 |
| Ultimate Duck Hunting (2006) | 361,637 | 23 |
| Ultimate Epic Battle Simulator (2017) | 1,352,303,040 | 20,659 |
| Ultimate Epic Battle Simulator 2 (2023) | 356,336,086 | 62,614 |
| Ultimate Fight Survival (2021) | 3,735,581 | 2,416 |
| Ultimate Fighter (1992) | 4,119,105 | 509 |
