The Red Flame Labyrinth is unlocked upon reaching lvl 15
Perfect Clear requirement is like other Labyrinths, remain alive for entire duration.
First map enemies are Blacks and Grays (Melee type nanobot wielders and Ranged type nanobot wielders respectively)
Warning: Both blacks and Grays will block often!
Second map (boss room) is Mure (Mission 4 boss) and Humbi (Mission 5 boss).
Objective for this part of the Labyrinth: Defeat Mure
A map of the labyrinth can be found above ^_^ credit to the legendary DeadMachine of GhostX forums