MAP19: The Spiral (Doom 64)

MAP19: The Spiral is the nineteenth map of Doom 64, designed by Tim Heydelaar. The level basically is killing loads of monsters in a large room which has a large staircase in it. If you look at the map from your automap, the level appears as a spiral. All you have to do is grab a red key and kill all the monsters that teleport in. Then you can go into the red door room and kill the last baron of Hell and exit. It uses the music track "Collision Course".

Bugs
The map has three unused macros and even if whatever object or line cause any of them nothing actually happens:
 * 1) The first macro would raise the ceiling of a sector with tag assigned to 2. Then, after a short delay, lowers floor of that sector along with a sector tagged to 1 to the somewhat far distance down. None of the sectors in the level have these tags, so the purpose of the macro remains unknown.
 * 2) The second instantly lowers a sector with a tag number 3 by 124 units. There is no sector having tag number three in this level. At least, intuitively one cannot guess an apparent purpose of this.
 * 3) Used for spawning things tagged with 5. None of things have this number as a tag data. The fifth tag was likely a typo while original source code of the macro was written.