| Unity of Command II (2019) | 3,639,614 | 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 |
| Universal Paperclips (2017) | 1,549,039 | 78 |
| Universal Studios Monsters: Dracula-Crazy Vampire (2001) | 1,359 | 6 |
| Universal Studios Theme Parks Adventure (2001) | 9,699,179 | 267 |
| Universe (1983) | 29,885,486 | 1,009 |
| Universe 51: Tannhäuser Wars (2022) | 486 | 8 |
| Universe at War: Earth Assault (2007) | 3,872,561 | 777 |
| Universe For Sale (2023) | 101,090 | 259 |
| Universe Has No Favorites (2024) | 346 | 11 |
| Universe Horizon (2024) | 36,786 | 7 |
| UNIVERSE PRISON (2021) | 196 | 3 |
| Universe Sandbox (2008) | 613,695,721 | 9,534 |
| Universe Size Comparison VR (2024) | 0 | 0 |
| UniverseV: Star Domination (2022) | 215 | 2 |
| Universim (2017) | 2,487,677 | 63 |
| The Universim (2018) | 62,235,734 | 7,645 |
| University King (2024) | 75 | 1 |
| University Tycoon - The College Management Simulator (2024) | 9,428 | 18 |
| UniWar (2009) | 94,741 | 45 |
| Unkilled (2015) | 57,482,585 | 8,110 |
| Unknightly (2017) | 840,317 | 56 |
| Unknot! (2025) | 0 | 0 |
| Unknown 9: Awakening (2024) | 5,247,540 | 2,770 |
| The Unknown City (Horror Begins Now.....Episode 1) (2018) | 892,673 | 486 |
| Unknown Fate (2018) | 839,564 | 486 |
| Unknown Hero (2025) | 0 | 0 |
| Unknown Horizons (2009) | 163,432 | 55 |
| Unknown Number: A First Person Talker (2022) | 54,529 | 29 |
| Unknown Signal: Invasion (2024) | 310 | 6 |
| Unknown Soldier: Mokuba no Houkou (2008) | 1,073 | 8 |
| Unknown Tapes (2024) | 2,331,914 | 526 |
| Unlanded (2024) | 472 | 10 |
| Unleaving (2024) | 15,788 | 107 |
| Unless (2025) | 13,986,379 | 1,174 |
| Unlife (2022) | 22,412 | 38 |
| The Unlife of Gorlak (2025) | 3,354 | 26 |
| Unlight (2010) | 725,304 | 1,140 |
| Unlighted (2025) | 2,277 | 7 |
| Unlikely Heroes (2021) | 1,693,304 | 130 |
| Unlimited Saga (2002) | 1,501,297 | 1,533 |
| Unlimited Warriors (1996) | 16,491 | 8 |
| Unlinked Mask (2024) | 2,540 | 11 |
| The Unliving (2021) | 1,287,270 | 422 |
| The Unliving (2022) | 1,432,217 | 351 |
| Unluckily in Love (2023) | 125 | 3 |
| Unlucky Seven (2019) | 37,154 | 83 |
| Unmanned helicopter (2018) | 1,070 | 2 |
| Unmechanical (2012) | 2,462,584 | 1,055 |
| Unmemory (2020) | 209,810 | 57 |
| UnMetal (2021) | 17,785,240 | 6,782 |
| Unmurk (2023) | 96 | 4 |
| Unnamed Experiment (2024) | 829 | 5 |
| Unnatural (2018) | 2,820,036 | 224 |
| Unnatural Investigations (2022) | 28,473 | 42 |
| Unnatural: Benighted (2023) | 0 | 0 |
| Unnecessary Roughness '95 (1994) | 25,618 | 25 |
| Uno (1999) | 34,674,460 | 445 |
| Uno (2006) | 569,878 | 148 |
| Uno (2008) | 101,904,682 | 735 |
| Uno / Skip-Bo / Uno Freefall (2007) | 207,660 | 12 |
| Uno 52 (2006) | 19,441 | 46 |
| Uno Free Fall (2006) | 41,970 | 41 |
| Uno Rush (2009) | 5,120,879 | 34 |
| Uno With Friends (2019) | 7,598,850 | 1,566 |
| Unoffensible (2025) | 27 | 2 |
| Unou no Tatsujin: Hirameki Kosodate My Angel (2006) | 5,740 | 3 |
| Unpacking (2021) | 71,050,265 | 17,827 |
| Unpatterned Cut (2025) | 0 | 0 |
