| NES Nintendo Roms Name | File Size (Kb) | Downloads |
|---|---|---|
| Uncanny X-Men, The (U) [o3] | 74 Kb | 0 |
| Uncanny X-Men, The (U) [o4] | 74 Kb | 0 |
| Uncharted Waters (U) [!] | 239 Kb | 15 |
| Uncharted Waters (U) [b1] | 239 Kb | 0 |
| Uncharted Waters (U) [b2] | 239 Kb | 0 |
| Uncharted Waters (U) [o1] | 239 Kb | 1 |
| Underwater Mario (SMB1 Hack) [a1] | 30 Kb | 1 |
| Underwater Mario (SMB1 Hack) | 30 Kb | 4 |
| Underwater Mario Maze (SMB1 Hack) [a1] | 30 Kb | 1 |
| Underwater Mario Maze (SMB1 Hack) [a2] | 30 Kb | 1 |
| Underwater Mario Maze (SMB1 Hack) [a3] | 30 Kb | 1 |
| Underwater Mario Maze (SMB1 Hack) [a4] | 30 Kb | 1 |
| Underwater Mario Maze (SMB1 Hack) [a5] | 30 Kb | 1 |
| Underwater Mario Maze (SMB1 Hack) [a6] | 30 Kb | 1 |
| Underwater Mario Maze (SMB1 Hack) | 30 Kb | 1 |
| Underwater Mario Maze w-HI! Bubbles (SMB1 Hack) | 30 Kb | 1 |
| Underwater Maze Mario (SMB1 Hack) | 30 Kb | 1 |
| Unfinished Demo by Loopy (PD) | 8 Kb | 1 |
| Unicron (Pac-Man Hack) | 10 Kb | 1 |
| Uninvited (U) [!] | 132 Kb | 39 |