== UDMX ==
The fourth installment of the series was released on December 31st, 2008. UDMX is the first entry in the series to fully replace [[Doom II]]'s original 32 levels, several of which are replaced by remakes
, which are called "flashbacks" in the WAD , of maps found in UDMX's predecessors. The WAD boasts a new palette that saturates reds and greens and deepens blues. UDMX celebrates [[Unidoom]]'s 10th anniversary, bearing the "X" in its name to represent the ten years that had passed since the original founding of Unidoom at the time of the WAD's release. UDMX has received much critical acclaim throughout the community, and it has been said to be the best installment of the UDM series and one of the greatest deathmatch megawads to have ever been made.
A [http://www.youtube.com/watch?v=Z9ZU-SxMo_Y trailer] for it was released on March 23, 2008. A [http://www.youtube.com/watch?v=TgdIixFx1i0 follow-up trailer] showcasing newer maps was released on August 28, 2008.