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Name Unseen Assailant
Game Quake
Type Single player
Download FilePlanet

A miraculous feat for me, this level was entirely finished, save for the very first room, in a single week. One can see it is a direct descendant of Vigil of the Night (JJSPQ1), but Unseen Assailant manages to build on the theme of the previous level, and stand out on its own. In the end, despite being among the shortest single player levels I've seen, the level is a lot more polished than its predecessor. Another thing to note is that Unseen Assailant draws even more from various deathmatch levels, and actually offers a non-linear progression, something I've yet to recreate in other levels.
The level was released back in 1999.