25 wads
| File | Name | Author | Iwad | Demos | Length |
|---|---|---|---|---|---|
| ub | ub | Matt Walter | doom | 2 | 5:26 |
| uca | uca | Eddie Nguyen | doom | 2 | 8:38 |
| u_chasm | u_chasm | Chris Hansen | doom2 | 1 | 5:06 |
| ud1_10 | ud1_10 | Chris Welch | doom | 2 | 1:11 |
| ud1k | Death by 1000 Lines | Various | doom | 25 | 4:20:50 |
| ud94 | Undeath '94 | Various | doom | 1 | 38:19 |
| udino | The Ultimate Doom "In ... | Various | doom | 10 | 1:55:46 |
| udm05 | udm05 | Marek Wozniak | doom2 | 2 | 5:34 |
| udtwid | Ultimate Doom The Way ... | Various | doom | 11 | 17:09 |
| uhadron | (The Ultimate) Return ... | Matt "Cannonball" Powell | doom | 21 | 53:28 |
| ultim | ultim | Emil Eisenhardt | doom | 4 | 5:24 |
| ultima | Ultima 1 | Jon Charlson (Chaff) | doom | 3 | 1:09 |
| ultima6 | Ultima6, Lord British'... | Ken Wieczorek | doom2 | 2 | 1:11 |
| ultimate_1994 | ultimate_1994 | Sean Powers | doom | 20 | 1:22:32 |
| ultimate_2008 | ultimate_2008 | Justin Lloyd | doom2 | 4 | 5:35 |
| ultimatm | Ultimatum - Riding on ... | Various | doom | 1 | 32:36 |
| ultradm | ultradm | Scott Manganello | doom | 10 | 5:03 |
| umbrella | umbrella | Epyo | doom2 | 2 | 3:36 |
| umbring | umbring | Woody | doom | 1 | 15:02 |
| unalign | unalign | Ryath/scwiba | doom | 17 | 58:57 |
| unbeliev | UnBeliever | Ryath/scwiba | heretic | 28 | 43:17 |
| uncrtn | uncrtn | Mr. Chris | doom2 | 2 | 9:47 |
| undcrpt_2 | undcrpt_2 | Artem | doom2 | 1 | 3:14 |
| under | under | Mark Matheson | doom | 4 | 7:20 |
| undersea | undersea | Brian Plumb | doom | 1 | 4:41 |