Split jumptrill: A jumptrill which uses both hands at the same time to perform correctly - i.e two one-handed trills.

Every note should correlate to a sound present in the music.

Exceptions in favor of simplification should be made when following the music completely accurately...

would be unreasonable to play with full accuracy.
would be effectively represented with a consistent, predictable snap
would cause an inappropriate difficulty spike.

Long notes should not have release timings that use different timing snaps. For example, long note releases should not have a 1/3 snap on the end of it and a 1/4 snap at the end of another.

If Normal is the lowest difficulty of a beatmap set, it has to abide by these additional rules:

Consecutive 1/4 snaps may only be two notes long. More dense rhythms are not appropriate for the lowest difficulty of a beatmap set.

Jack usage is discouraged. These can be too physically demanding for players of this level. Minijacks with ample rest time in between may be acceptable.

If Hard is the lowest difficulty of a beatmap set, it has to abide by these additional guidelines:

Chords within streams are discouraged. The density of these patterns is often too difficult for players of this skill level, especially when used on the lowest difficulty of a beatmap set. However, using a chord at the beginning/end of a stream is fine.

Avoid 1/8 streams lasting longer than 4 beats. Streams of this type of snap are hard to execute and should only be used if the song warrants it.

Using jump trills of any kind that lead to a hand is discouraged. Unless a beatmap uses jacks frequently or other complex patterns frequently, this pattern is difficult to hit at a moderate to high speed. For 4K, this creates a mini jack that drastically increases the pattern difficulty. If a hand is really necessary, delete the note before it that would create the mini jack.

Avoid more than 5 consecutive split jump trills. These are more physically exhausting than other patterns of similar density.

Kawawa wrote:

umm I know It's for guidelines but here something weird a bit.
If we restrict it, all the jump trills will have the same type to avoid a jack. and especially for 4K, the limit of SR is depends on the BPM. so most of them are ended as Insane difficulty. so most 4K mapsets will be same place on the ground If we mind it. so yeah It will make a huge change in the future. so before making the final decision for insane guidelines, need to think the past. what I'm trying to say is that the thing has never been considered in the past of osu!mania history since the communities are satisfied about the freedom of pattern choices. And yeah still not really have a negative impact because It's preferentially judged by BNs in the process of the ranked. so I wonder it should be on here.
If this is really needed, It should be applied for hard difficulty or when insane diff is not a last level of the mapsets(like ENH"I"I), should be.
so It has to make an exception case like this in my opinion.

anyways, all the rest are fine to me. good work!

Shoegazer wrote:

This is extremely important (and I'm not sure if this is overlooked), but consecutive 1/4 snaps should be three notes long at least. In a map with mostly 1/2 rhythms, a 1/4 gallop (2 consecutive 1/4s) requires omitting a potential 1/2 note, which would cause timing difficulties (especially for new players) and major issues if you were to layer a certain sound consistently.

Kuo Kyoka wrote:

Why?
From then till now I have no problems in trying it and yet I saw most to everyone can do it perfectly to frequently in mapping.
Not only because it's now common that makes everyone can stick it with it in every maps but also for some reasons
But first, jumptrill with hand
[12] [34] [123]
[12] [34] [124]
[13] [24] [123]
[13] [24] [124]
[14] [23] [123]
[14] [23] [124]
Thus the opposites
Not to mention other possibilities as
[12] [24] [134]
[12] [23] [134]
...
And don't forget, 4K is not the only keymode have jumptrill

And why you need an extra note?
First in musical logic, if the bass continuously and have no changes in the volume, you can stick with 2 notes jumptrills for challenge and specific the difficulty of the map, and second is the cymbal after it, and yes it's common in most songs, making it 2 notes and classify it being the same with the bass/snare next to it is quite absurd because, kick/snare already 2 notes while cymbal + kick/snare should have higher amount of notes, when normal kick/snare regularly with jumptrill of 2 notes.
I would say it's more of the song itself, if it sounds lighter and you put the same jumptrill wouldn't make senses, meanwhile if its building up stronger and you delete a note before it would make any senses either, it lost the purpose of it, and thus, for consists between parts with that same kind of sounds. However, it's being more on the mapper's judgment of his/her's map as well, restricting something that already happens over the years would be pretty absurd since literally nobody to a real small amount of people did complains to it, over than that, I have never seen other having trauma from passing it during qualified section and yet I user it pretty common, even [12] [34] [1234] (so does 7K).
Mapping it in a freedom way, let the mapper choose what is the best for the map, but yet needs to be reasoning for it, as I mentioned above, so this guideline is quite useless imo.

And, I think I will post some opinions as well when I got the time

Kawawa wrote:

And about the jump between the trills is, It may be very uncomfortable according to the bpm, so It is necessary to know whether the chart has reached reasonably about that. but the jump at the end is actually works as an extra-code for the last part for highlight.
so yeah, communities are using it frequently but nevertheless no complaints. because they are mostly analogous in the way to reaching freedom of the pattern choices and reasonable points. so as I said, so for apply the guidelines reasonably It would be great when the mapsets have the two insane diff(so for lower insane diff). 4K is actually limited to songs that can reach 'EX' icon. so most of their last level are mapped to Insane diff. so It's frequently see the 4k sets have 2-3 Insane spread.

MEGAtive wrote:

I believe Easy-Normal-Hard progression is a common sense that need no further breakdown. Patterns used in these diffs are pretty basic. They only need a pattern/rhythmical limitation to shape the structure up.

What needs to be breakdowned is Insane-Expert as these two in execution may intertwined with each other. As defining difficulty may be subjective and each people skillsets are different which makes some people believe the Expert felt easier than Insane.