ok so a friend of my said that doing MR 9 test is too difficult to pass due to the Enemies able to detect you at extreme range (kinda like Eidolon map detection range). so i tested it out myself and here is the result.
1. Enemies detection range
_ as i have said they have extremely high sensitive detection, one of the test i tried to hide behind the pillar and he somehow detected me and fail one try. what?? how?
_ 2nd time is that when i tried to stealth kill a grineer and the grineer on the walkway from far away able to detect me killing the grineer and fail another try.
_ at stage 2 of the stealth test, you spawn in....in front of the enemies...result in instant fail (why???)
2. Stealth kill range
_ ok this is not a major problem but...you are forced to somehow stay extremely near behind enemies back to able to perform the stealth kill, 1 out of 20 stealth kill, you will bump into enemies and alert them, what do you know? fail.
_ sometime when you stealth kill enemies, they still detected you even if they died?? (prove me wrong on this one or im that lucky to get this bug)
4. Meta weapon
_ only Glaive / Redeemer able to help you with this one, it is possible to use other weapons to pass the test but it near impossible to.
5. Execution time is not your friend
_ whatever you do...don't take any weapon that take too much time on execution, it will result in enemies that are approaching to your area or on patrol and got you in their "Extreme" line of sight, resulting in you failing the mission.
_ yeah....idk chief, leaving the corpses there for enemies to be on full alert is not the best but....it almost impossible to deal with this as the test area is quite open resulting in enemies on full alert.
final Verdict: MR9 test is too difficult, it needs a fix and so does the stealth mechanic or remove this test and replace by something better. it is possible to pass this test with Glaive and redeemer but not everyone at MR9 would craft those or already sold them for weapon slots. please allow this mission to be possible for all melee and not restricted to ranged melee only (even if u got ranged melee you still have a hard time trying to pass it). i tested 10 times and only twice that i passed.
if you think that is fair then perhaps give the test a re-try (im at MR 26 and re-take this test to make sure if my friend MR9 is joking and i somehow questioned myself how did i passed this test at 1st try back then?)
p/s: you can just summon Arch-gun and kill everything to pass this test if you shoot them fast enough. except my friend don't have arch gun unlocked yet. sound stupid i know but it worked.
fine DE, if u dont fix stealth...i will fix it...with bullets