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This level occupies the map slot MAP19. For other maps which occupy this slot, see Category:MAP19.
Impure serenity is the nineteenth map of Speed of Doom. It was designed by Josh Sealy and uses the FFXII Eruyt Village track from vgmusic.com. The par time is unknown.
There is no secret sector.
You can have the megasphere either with an archie jump from the yellow key zone, or by strafe-running from the room with the SSG's window (use the small crates to get onto the window ledge) onto the platform.
You will need to strafe run if you want the green armor behind the red key.