8th September 2020, 10:03 PM
(This post was last modified: 8th September 2020, 10:04 PM by AspectZero. Edited 2 times in total.)
After playing this in nearly it's entirety, I have a better idea of which of these levels are hardest.. This post may be controversial, as it is based on what I consider to be more difficult for myself. This will be ordered hardest to easiest, so that you don't have to scroll down to find the hardest levels. 
1. Nightmare by AspectZero (This level's gameplay is repetitive in some parts and not enjoyable.)
2. Frustration 145 by Firefight (This level has excellent gameplay.)
3. Sonia[Frust] by Apex Frusts (This level has excellent gameplay.)
4. [Frust] Sticky Situation by 898ppp (This level has fun gameplay, a few unnecessary difficult parts.)
5. [Impossible]Co-Frust by Vipa (This level has poor gameplay.)
6. 150 Steps Easy by Fire N Screw (Improperly tested by creator - terrible gameplay.)
7. Grim Easy by Firefight (Improperly tested by creator - terrible gameplay.)
8. Frustration 2 by Intrpd (Very easy after some practice.)
9. Rage 101 by 898ppp (This level is sort of boring.)
10. Frustration Course by Munim (Lots of low jumps, this level is very fun and very difficult.)
11. Terror[Frust] by AspectZero (This level has good gameplay.)
12. Serpent[Frust] by Magniloquent (This level has excellent gameplay.)
13. Frust (HARD) by Miniberry83 (Improperly tested by creator - terrible gameplay.)
14. The Gauntlet by TRUC (Improperly tested by creator - terrible gameplay.)
15. The Net Dance by The Unforgiven (Improperly tested by creator - terrible gameplay.)
16. Depression[E] by Kwing (Improperly tested by creator - terrible gameplay.
17. [Frust]Overseer by AspectZero (This level was created by bi3liu. This level has excellent gameplay.)
18. Pure Skillz by Fran10 (This level has very fun gameplay.)
19. [Legend] Co-Frust by Vipa (This level has poor gameplay.)
20. Century(Platinum) by AspectZero (This level has decent gameplay.)
21. Prince Of Persia by Fran10 (This level has excellent gameplay.)
22. Tenth Judgement by Taco2 (This level was made as a challenge to see if people *could* beat it, not so that it could be beaten, very bad gameplay.)
These are the hardest levels in Trial and Error for me, and my opinions on them, do with this information what you will.
1. Nightmare by AspectZero (This level's gameplay is repetitive in some parts and not enjoyable.)
2. Frustration 145 by Firefight (This level has excellent gameplay.)
3. Sonia[Frust] by Apex Frusts (This level has excellent gameplay.)
4. [Frust] Sticky Situation by 898ppp (This level has fun gameplay, a few unnecessary difficult parts.)
5. [Impossible]Co-Frust by Vipa (This level has poor gameplay.)
6. 150 Steps Easy by Fire N Screw (Improperly tested by creator - terrible gameplay.)
7. Grim Easy by Firefight (Improperly tested by creator - terrible gameplay.)
8. Frustration 2 by Intrpd (Very easy after some practice.)
9. Rage 101 by 898ppp (This level is sort of boring.)
10. Frustration Course by Munim (Lots of low jumps, this level is very fun and very difficult.)
11. Terror[Frust] by AspectZero (This level has good gameplay.)
12. Serpent[Frust] by Magniloquent (This level has excellent gameplay.)
13. Frust (HARD) by Miniberry83 (Improperly tested by creator - terrible gameplay.)
14. The Gauntlet by TRUC (Improperly tested by creator - terrible gameplay.)
15. The Net Dance by The Unforgiven (Improperly tested by creator - terrible gameplay.)
16. Depression[E] by Kwing (Improperly tested by creator - terrible gameplay.
17. [Frust]Overseer by AspectZero (This level was created by bi3liu. This level has excellent gameplay.)
18. Pure Skillz by Fran10 (This level has very fun gameplay.)
19. [Legend] Co-Frust by Vipa (This level has poor gameplay.)
20. Century(Platinum) by AspectZero (This level has decent gameplay.)
21. Prince Of Persia by Fran10 (This level has excellent gameplay.)
22. Tenth Judgement by Taco2 (This level was made as a challenge to see if people *could* beat it, not so that it could be beaten, very bad gameplay.)
These are the hardest levels in Trial and Error for me, and my opinions on them, do with this information what you will.
-AspectZero
