25 wads
| File | Name | Author | Iwad | Demos | Length |
|---|---|---|---|---|---|
| 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 | 14 | 58:27 |
| 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 |
| undertow | undertow | Gregory Dick | doom2 | 2 | 18:22 |
| undrfire | Under Fire for Doom 2 | Jeff Cruser | doom2 | 3 | 3:49 |
| undrseig | undrseig | Gene Spinks | doom2 | 1 | 2:07 |
| unfun | unfun | Adrian Roselli | doom | 4 | 3:07 |
| unhallowed | Unhallowed | CyanoBlugron | doom2 | 1 | 30:11 |
| unisin | unisin | Merlin of Pleth | doom2 | 6 | 1:42 |
| unknown | unknown | Dutch Devil | doom2 | 2 | 15:59 |
| unnamed | unnamed | Mr. Chris | doom2 | 1 | 9:12 |
| unrattled | UNRATTLED | Various | doom | 12 | 1:05:12 |
| unttld | Untitled | Thelokk | doom2 | 1 | 5:01 |
| unwisdom | Castle of Unwisdom | Ittaanip | doom2 | 1 | 2:25 |
| upliftng | upliftng | Bart Wilson | doom | 3 | 11:46 |
| uplink15 | uplink15 | Zoltan Schmidt | doom2 | 4 | 13:56 |