| Game | Platform | Developer | Publisher (JP) | Publisher (NA) | Publisher (PAL) |
|---|---|---|---|---|---|
| Unchained Blades | Nintendo 3DS, Sony PSP | FuRyu | FuRyu | XSEED Games | N/A |
| Uncharted Waters | MSX, Microsoft Windows, Nintendo Entertainment System, Sega Genesis, Super Nintendo Entertainment System, macOS | Koei Tecmo Games | Koei Tecmo Games | Koei Tecmo Games | N/A |
| Uncharted Waters Online | Microsoft Windows, Sony PlayStation 3, Sony PlayStation 4 | Koei Tecmo Games | Koei Tecmo Games | Netmarble, OGPlanet | Netmarble, OGPlanet |
| Uncharted Waters: New Horizons | Microsoft Windows, NEC PC-98, Nintendo Wii, Nintendo Wii U, Sega Genesis, Sega Saturn, Sony PlayStation, Super Nintendo Entertainment System | Koei Tecmo Games | Koei Tecmo Games | Koei Tecmo Games | Koei Tecmo Games |
| Undecember | Android, Microsoft Windows, iOS | Needs Games | N/A | LINE Games | LINE Games |
| Under the Castle | Playdate | Dani Diez, VolcanoBytes, ZCorbs | N/A | Dani Diez, VolcanoBytes, ZCorbs | N/A |
| Under the Island | Microsoft Windows, Microsoft Xbox One, Microsoft Xbox Series X|S, Nintendo Switch, Sony PlayStation 4, Sony PlayStation 5 | Slime King Games | Doyoyo Games | Top Hat Studios | Top Hat Studios |
| Undernauts: Labyrinth of Yomi | Microsoft Windows, Microsoft Xbox One, Nintendo Switch, Sony PlayStation 4, Sony PlayStation 5 | Experience | Experience | Aksys Games | Numskull Games |
| Underrail | Microsoft Windows | Stygian Software | N/A | Stygian Software | Stygian Software |
| Undertale | Linux, Microsoft Windows, Nintendo Switch, Sony PS Vita, Sony PlayStation 4, macOS | Toby Fox | 8-4, Toby Fox | 8-4, Toby Fox | Toby Fox |
| Undertale Yellow | Microsoft Windows | Team Undertale Yellow | N/A | Team Undertale Yellow | Team Undertale Yellow |
| Undungeon | Linux, Microsoft Windows, Microsoft Xbox One, Nintendo Switch, Sony PlayStation 4, macOS | Laughing Machines | N/A | Laughing Machines | Laughing Machines |
| Unexplored 2: The Wayfarer’s Legacy | Microsoft Windows, Microsoft Xbox One, Microsoft Xbox Series X|S, Sony PlayStation 4 | Ludomotion | N/A | Big Sugar | Big Sugar |
| Unforeseen Incidents | Linux, Microsoft Windows, macOS | Backwoods Entertainment | N/A | Application Systems Heidelberg | Application Systems Heidelberg |
| Unforetold: Witchstone | Microsoft Windows | Spearhead Games | N/A | Spearhead Games | Spearhead Games |
| Unicorn Overlord | Microsoft Xbox Series X|S, Nintendo Switch, Sony PlayStation 4, Sony PlayStation 5 | Vanillaware | Atlus | Atlus | Atlus |
| Unlikely Heroes | Microsoft Windows | Valkyria Games | N/A | Valkyria Games | Valkyria Games |
| UNLIMITED SaGa | Sony PlayStation 2 | Square Enix | Square Enix | Square Enix | Atari |
| Unraveled: Tale of the Shipbreaker’s Daughter | Microsoft Windows | RosePortal Games | RosePortal Games | RosePortal Games | RosePortal Games |
| UNSIGHTED | Microsoft Windows, Microsoft Xbox One, Nintendo Switch, Sony PlayStation 4 | Studio Pixel Punk | Humble Games | Humble Games | Humble Games |
| Unsouled | Microsoft Windows, Microsoft Xbox One, Microsoft Xbox Series X|S, Nintendo Switch | MeGusta Game | Neowiz | Neowiz | Neowiz |
| Unsung Story | Android, Linux, Microsoft Windows, Microsoft Xbox One, Nintendo Switch, Sony PlayStation 4, iOS, macOS | Little Orbit, Playdek | Little Orbit | Little Orbit | Little Orbit |
| Untamed Tactics | Microsoft Windows | Grumpy Owl Games | N/A | 2P Games, Ravenage Publishing | 2P Games, Ravenage Publishing |
| Until Dawn | Sony PlayStation 4 | Supermassive Games | Sony Interactive Entertainment | Sony Interactive Entertainment | Sony Interactive Entertainment |
| Until Dawn (Remaster) | Microsoft Windows, Sony PlayStation 5 | Ballistic Moon, Supermassive Games | Sony Interactive Entertainment | Sony Interactive Entertainment | Sony Interactive Entertainment |
