Escape from the jail and kill the enemy - By Michal Kamaryt
First things first. Don't read into the plot of this mod at all because there isn't one. It's simply a series of killboxes and jumping sections and frankly shouldn't have been released as a "mod" at all. For a mod released in 2006, the mapping is abysmal and there are several sections where you NEED to use noclip to progress.
The only real use of this mod is as an endurance test if you play through on Hard difficulty, but don't expect to enjoy it.