Descent I, Level 9, insane difficulty, cold start, no death, full rescue, 130HP at exit
Difficulty rating: 4 (very hard)
Replayed this level because in the previous recording I've spent excessively lot of time luring the enemies.
This is level is one of the hardest levels in the game. There are corridors that doesn't offer too much room to evade projectiles. Also lot of enemies placed just behind the corner meters from you. The level has this annoying red color, with red enemies, firing red projectiles. Mars is red planet, but not as red as a stop light. Also secondary lifters are have a tendency to chase you, making you run into a cluster of enemies who will beat the shit out of you. Then finally you must be very fast, kinda speedrun like, because if enemies go roaming there is a high chance they'll come from behind. There is simply no enough time to clear all enemies, you can see advanced lifters and cloaked lifters already started hunting for me when I reached the lava basement. It took me at least a hundred attempts to clear the corridors.
After you cleaned the corridors the remaining of the level is not too hard. Cleaning the path to the exit is a bit risky.