||[[Unpredictaball]]|| 1992 || Video Images || No || Converted by Phantomz<br/> J1B2 = Pause (J1B1 = Resume game, Pause button = Quit game). || [[Media:Unpredictaball.rar | Unpredictaball.rar]]
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||[[Untouchables (The)]]|| 1989 || Ocean Software || No || Converted by Phantomz<br/>Pause button = Pause (Pause button = Quit game, any other button to resume game)<br/>CHEAT (Level skip): Just press J2b1 J2B1 while playing || [[Media:Untouchables (The).rar | Untouchables (The).rar]]
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||[[Uridium]]|| 1986 || Hewson Consultants || No || Converted by CraigsBar || [[Media:Uridium.rar | Uridium.rar]]
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||[[Usagi Yojimbo]]|| 1988 || Firebird || No || Converted by Phantomz<br/>Trainer : J1B1/B2=Yes/No, J1B2 = No<br/>Main Menu : J2B1 = Joy 2 + Pause Swap Practice/Game (don't forget to change from Practice Swap to 'Game' mode before starting to play), J2B2 = Swap Joystick/Keyboard, Pause button = Start game<br/>GX4000 Ingame: Pause button = Pause, any button to Unpause. Keep pressing the pause button (or any Any button on Joypad 2) to pass resume) / Skip the highscore tableholding the button.|| [[Media:Usagi Yojimbo.rar | Usagi Yojimbo.rar]]
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||[[Uwol 2 Quest For Money]]|| 2011 || The Mojon Twins ||No|| Converted by McKlain || [[Media:Uwol 2 Quest For Money.rar | Uwol 2 Quest For Money.rar]]