Hey, im Wallblip, someone who has been playing and TASing parkour for over 5 years now, and someone who is known in the english pk central community as one of the greatest parkourers (under my other account Kha0x), playing through every single level and modifier medal i have so far found 3 levels which are 100% impossible, all of them in medium using a jump boost and blindness modifer. These levels are Beach 4 with jump boost and blindness (the triple slime), Circuit 5 with jump boost and blindness (slime from top of ladder tower to other ladder) And House 1 with jump boost and blindness, this time the ice jump near the end (in particular the 5-.5 at the end). The reason these levels arent possible is due to how different momentum loss is with that modfier, as you technically gain speed faster from the extra speed they give since you cant sprint, but not being able to sprint means you lose it a lot faster, making some distance jumps a lot more difficult, or in some cases, impossible. Those 3 maps above I have tested outside of the server with the exact same settings with commands, as well as inside the server, and even with the use of tick perfect (macroed in singleplayer) turns, perfect 45 strafes, and a few other complex strategies, those 3 levels are still not possible due to the different momentum loss. I still have a few medium maps with modifiers left so i might end up finding a few more but they are all of them up until retro in medium at least for now. Some maps, like one of the ones in cinema, ive seen people saying isnt possible however ive managed to create a complicated strat, using very precise cords and a 45 strafe, which Just makes the certain jump possible. Ill leave another reply at some point if any of the few levels i havent done yet are also impossible, but from using different tools and my knowledge of all the ways to optimize a jump, i can confirm those 3 levels at least are not possible through normal means, meaning the (currently 6) players to have completed all maps have used some sort of cheat or exploit. (i have also checked for unintended routes in all the maps to skip the impossible jumps, yet they dont have any, meaning the players had to have used exploits for those 3 maps.) If you want to ask more about what ive done through testing, message me with an actual responce, dont just say "they are just better", ive proven a few jumps to not be possible with that modifier and i can make a video showcasing those few jumps if I need to.