| Unfabulous (2006) | 228,102 | 55 |
| Unfair Jousting Fair (2015) | 488,784 | 18 |
| Unfair Rampage: Knightfall (2025) | 753 | 10 |
| The Unfallens: Awakening (2023) | 1,862 | 48 |
| Unfinished Dream of All Living Ghost (2023) | 8,811,184 | 2,117 |
| The Unfinished Swan (2012) | 3,516,530 | 2,487 |
| The Unfinished Swan (2020) | 7,324,703 | 980 |
| Unfinished Tales: Illicit Love (2012) | 36,009 | 44 |
| Unfolded : Camellia Tales (2021) | 2,905 | 21 |
| Unfolded Cube (2024) | 36 | 2 |
| UNFOLLOW (2023) | 4,661,270 | 848 |
| Unforeseen Incidents (2018) | 1,019,641 | 1,390 |
| Unforetold: Witchstone (2024) | 237,603 | 52 |
| Unforgettable Voyage (2023) | 5,610 | 11 |
| Unforgettable You (2021) | 246 | 8 |
| Unforgivable: Eliza (2018) | 13,177 | 7 |
| Unforgiving Happiness (2017) | 0 | 0 |
| Unforgiving Trials: The Space Crusade (2016) | 0 | 0 |
| Unforgiving: A Northern Hymn (2017) | 24,075,592 | 2,518 |
| Unforgotten: Ordinance (2025) | 9,103 | 64 |
| Unfortunate Spacemen (2020) | 7,378,874 | 1,279 |
| UnFound (2021) | 3,635 | 9 |
| Unfriendly Friend (2026) | 0 | 0 |
| Unhack (2015) | 12,650 | 51 |
| Unhack 2 (2017) | 759 | 13 |
| Unhappy Ever After (2017) | 4,557 | 19 |
| Unheard (2019) | 3,776,848 | 1,218 |
| UNHEIM (2024) | 518,277 | 94 |
| Unhinged 2 (2025) | 5,356 | 15 |
| Unholy Alliance - Tower Defense (2021) | 859 | 16 |
| UnHolY DisAsTeR (2018) | 3,058,897 | 57 |
| Unholy Heights (2013) | 943,291 | 672 |
| Unholy Night: The Darkness Hunter (2017) | 397,302 | 138 |
| The Unholy Society (2020) | 80,819 | 46 |
| UnHolY ToRturEr (2019) | 0 | 0 |
| The Unholy War (1998) | 441,287 | 482 |
| UNI (2019) | 436,529 | 98 |
| Uni's On Air (2019) | 1,006,588 | 521 |
| UniBall (1999) | 10,064 | 4 |
| Uniborne (2022) | 93 | 4 |
| Unicorn Dungeon (2018) | 2,441 | 36 |
| Unicorn Overlord (2024) | 29,543,056 | 34,198 |
| The Unicorn Princess (2019) | 2,990,448 | 300 |
| UniDuni (2023) | 4,352 | 24 |
| Uniform Girl (2020) | 30,774 | 17 |
| Unihorn (2024) | 661 | 5 |
| Uninvited (1986) | 4,948,087 | 1,091 |
| Uninvited Guest (2021) | 18,221,621 | 1,589 |
| Union of Gnomes (2024) | 299,771 | 298 |
| Unioverse Proving Grounds (2024) | 0 | 0 |
| Unique Ladies (2025) | 0 | 0 |
| Uniracers (1994) | 836,312 | 731 |
| Unit 13 (2012) | 3,106,799 | 586 |
| Unit 4 (2017) | 803,812 | 104 |
| Unit 404 (2020) | 18,194 | 69 |
| Unit Down Charge (2025) | 381 | 7 |
| UNITED 1944 (2023) | 285,856 | 180 |
| United Assault - Normandy '44 (2021) | 218,596 | 117 |
| United Assault - World War 2 (2023) | 175,023 | 42 |
| United by Love's Heart (2025) | 0 | 0 |
| United Chronicles (2021) | 1,864 | 6 |
| United Heist: Facility Zero (2026) | 0 | 0 |
| United Penguin Kingdom (2024) | 749,407 | 1,304 |
| The United SPACE of America (2022) | 96 | 3 |
| United States of America Jigsaw Puzzles (2023) | 0 | 0 |
| Unitia (2018) | 132,433 | 117 |
| Unity of Command (2011) | 476,278 | 379 |
| Unity of Command II (2019) | 3,639,544 | 2,315 |
| Unity of Command: Stalingrad Campaign (2012) | 61,452 | 70 |
| Unity Testing Grounds (2022) | 0 | 0 |
| Unity-chan the SharpShooter! (2024) | 0 | 0 |
| Universal Boxing Manager (2004) | 17,781 | 2 |
| Universal Combat (2004) | 121,665 | 149 |
| Universal Hero (1986) | 10,055 | 31 |
| The Universal Military Simulator (1987) | 5,513 | 15 |
