| 2001431 | Understanding Microprocessors | - | English |
| 2000400 | Understanding Your Spectrum | - | English |
| 2000401 | Understanding Your ZX81 ROM | - | English |
| 25990 | Underworld | ZX-Spectrum 48K | English |
| 10369 | Underworld - The Village | ZX-Spectrum 48K | English |
| 43288 | Underworld Escape | ZX-Spectrum 48K | English |
| 9446 | Underwurlde | ZX-Spectrum 48K | English |
| 22754 | Unerase | ZX-Spectrum 48K | English |
| 22767 | Unerase (+3) | ZX-Spectrum 128 +3 | English |
| 22214 | Unfrag | ZX-Spectrum 128 +3 | English |
| 34447 | Unhallowed | ZX-Spectrum 128K | English |
| 14032 | Uni-Dos | ZX-Spectrum 48K | English |
| 19812 | UniMax | ZX-Spectrum 48K | English |
| 22354 | Unidisc! | ZX-Spectrum 48K | English |
| 26189 | Union Flag | ZX-Spectrum 16K | English |
| 41583 | Union Jack | ZX81 16K | English |
| 22876 | Uniprint | ZX-Spectrum 48K | English |
| 19659 | Unique | ZX-Spectrum 48K | English |
| 22588 | Uniscroll | ZX-Spectrum 48K | English |
| 5516 | United | ZX-Spectrum 48K | English |