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Hi all! As CTB specific difficulties are now rankable, we can continue the discussion about Rules/Guidelines here.

These are the ones crafted by Shiirn ( p/1345697 )

Catch the Beat Rankability Rules and Guidelines

Rules

They may not be broken under any circumstance.
  • You must avoid all current bugs within the hyperfruit system to keep your map passable. These will be gone over later on, below.
  • Autoplay (salad!) must SS the map. Nevertheless, it doesn't show you what jumps are bugged/impossible to catch.
  • Your map must theoretically be SSable. This generally means you must be able to catch absolutely all fruits, including droplets. This ties in the previous point, but is fundamentally for different reasons.


Guidelines

They are important and should be followed in most maps. Nevertheless, they could be broken in special cases.
  • Each CTB difficulty should be labelled according to its level of difficulty: Image Cup / Image Salad / Image Platter / Image Rain / Image Overdose, Deluge (in case there's a 2nd harder Extra diff). However, there's no need to add the acronym "CTB" since non-standard diffs have their own identification icon.
  • The recommended Approach Rate for a catch the beat difficulty of "normal" difficulty (in accordance with Taiko, this is the "insane"-ish level of play, not an actual "normal") is AR8. AR9 can be used for faster paced songs as determined by the mapper, but AR10 should never be used for a below-superinsane level of play.
  • Overall Difficulty should have the same value as the Approach Rate. This is just a standardized value, as OD does not affect gameplay nor the amount of fruits a spinner has, just the max score of a difficulty.
  • Bear in mind that CtB difficulties are meant to be fun to play, not a random experimentation with the editor. Make sure your map is fun, even if it's difficult! This comes only with practice. This includes making sure you don't spam 20 hyperdashes in a row - that's not fun, that's exhausting and frustrating.
  • Make sure your combos aren't too long! Bear in mind that sliders count as two fruits on Ryuuta's plate, and that you can't see new combos while in gameplay. A good, general baseline is a maximum of ten (10) fruit for a full combo. This is so that the fruit you catch doesn't block your view!
  • Bearing the previous point in line, your spinners shouldn't be too long! Spinner fruits also "stack up".
  • Avoid placing notes closer than 1/2 to a spinner. That'll make the notes near a spinner easier to read/sightread, helping the player to place the ryuuta in the correct position for the 1st note after a spinner.


Hyperfruit issues

Generally speaking, if you believe that your map might be impossible to clear, please consult a MAT or BAT or another experienced CtB player as to whether your map fits these bugs.
  • In-slider jumps: This occurs when the horizontal slider velocity is so high that Ryuuta cannot catch both sides without a hyperfruit, yet the slider is long enough that a droplet appears. Droplets cannot become hyperfruits, and mess with the coding such that no hyperfruits appear. The borderline for this bug seems to be a horizontal velocity of 600BPM (Your map's BPM * Your Slider Velocity, directly horizontal), so beware using overall velocities over 400bpm!
Last edited by Deif on , edited 12 times in total.
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Ѽ CTB difficulties modding assistance Ѽ (+standard) ~ Catch the Beat Rules/Guidelines Discussion Thread

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Change log:

Jan 15th, 2013:
  • Removed paragraph about pixel jumps.

Nov 12th, 2012:
  • Added a video in the pixel jumps section.

Sep 30th, 2012:
  • Converted labelling rule as a guideline.

Sep 25th, 2012:
  • Moved "1/2 distance note-spinner" rule to guidelines. Slightly rewritten due to recent spinner update.
  • Added "OD = AR" guideline.
  • Removed Max Score rule.

May 10th, 2012:
  • Standardized CTB specific names.

April 15th, 2012:
  • Modified spinner rule.

April 13th, 2012:
  • Thread created.
  • Grouped all the rules.
  • Added rule: Autoplay.
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Ѽ CTB difficulties modding assistance Ѽ (+standard) ~ Catch the Beat Rules/Guidelines Discussion Thread

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Nice, Deif:3
There are much less CTB maps than taiko because most of CTB mappers are freaks and make non-FCable beatmaps.
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To do a ctb diff which is able to became rankable is not easy, but with time and experiance it will become more easier and faster. And of course maybe the standard mappers will start to search ctb diffs too for his or her own maps, now they are just accept the taiko diffs. ._.
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Your map must theoretically be SSable. This generally means you must be able to catch absolutely all fruits, including droplets. This ties in the previous point, but is fundamentally for different reasons.

As Zelos said before, the ryuuta's plate must catch all the fruit, and no fruit must be in off-screen, this is unrankable.
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Auto make a good deal sometimes too, a map which is not FCable by Auto, isn't FCable by Players.
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The first 3 rules are already covered by the general rules so they're redundant, any possible CTB Skinning issues should be brought up as a general rule because they affect the whole mapset (incl. regular diffs played on CTB) not just the CTB-specific diff, the rest looks fine to me Keep going! o/
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HakuNoKaemi wrote:
Auto make a good deal sometimes too, a map which is not FCable by Auto, isn't FCable by Players.


No. Autoplay don't have speed limitation in movements... The result is : Hyperfruits issues are allways catched by autoplay and never by human, and even someone catch it one random day on one random play doesn't mean it's rankable, we don't want to see maps with 1ms reaction time jumps.

And if the autoplay miss, we don't need it to see if the map is FCable : In other words, when a fruit is uncatchable by autoplay you don't need to try with it, it's way too obvious (fruits on same ticks with huge spacing for example)
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Added a rule about Autoplay to complete the SSability of a map, and another one about skinning discussed in previous threads.
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Ѽ CTB difficulties modding assistance Ѽ (+standard) ~ Catch the Beat Rules/Guidelines Discussion Thread

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*facepalms* that's not what i meant, if you're going to make CTB rules/guidelines make them strictly based off the positioning of hit objects in CTB-specific maps, oh and score is fine too.

Any other rules will affect the entire mapset, why? let's make an example.

I make a mapset with only standard diffs and create a custom ryuuta for it without a flat plate, does the CTB rules affect it? no because there arent any CTB specific difficulties in the mapset, if you want it to affect it, it must be a general rule with it's own thread.

Edit: way better now
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Sakura Hana wrote:
*facepalms* that's not what i meant, if you're going to make CTB rules/guidelines make them strictly based off the positioning of hit objects in CTB-specific maps, oh and score is fine too.

Any other rules will affect the entire mapset, why? let's make an example.

I make a mapset with only standard diffs and create a custom ryuuta for it without a flat plate, does the CTB rules affect it? no because there arent any CTB specific difficulties in the mapset, if you want it to affect it, it must be a general rule with it's own thread.

Ok ok, updated OP post. Any other general rule (which affects the whole mapset) will be discussed in its own thread.
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Ѽ CTB difficulties modding assistance Ѽ (+standard) ~ Catch the Beat Rules/Guidelines Discussion Thread

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Quote:
No notes maybe placed closer than 1/2 to a spinner (1/2 is acceptable). This is because fruits are largely indistinguishable from spinner fruits when too close together.

largely depend on how fast the fruits descend and how many fruits the spinner contains, there are situations that a 1/4 can appear distinguishable and situations a 2/1 is indistinguishable from other fruits. A more general rule would maybe ban less cases, and favorite playable cases, you will ban unplayable cases supported by the current wording too.
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^@ Maybe create a guideline instead which contains the sentences of "avoid using" and "try to"
Because this would include special cases but implies that many-fruit-spinners with barely readable true-fruits right after them are almost not readable (only if you know it inbefore).

Avoid placing notes closer than 1/2 to a spinner (1/2 is acceptable) as far as possible. This is because, depending on the BPM of the song and length of the spinner self, fruits are largely indistinguishable from spinner fruits when too close together.
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Loctav wrote:
Avoid placing notes closer than 1/2 to a spinner (1/2 is acceptable) as far as possible. This is because, depending on the BPM of the song and length of the spinner self, fruits are largely indistinguishable from spinner fruits when too close together.

Sounds nice, but added as a rule, as it's an important factor to take into account for the readability of a map.

There are still some stuff to discuss about, like: how should the difficulties be named?

"XXX's CTB", "XXX's CtB", "XXX's CTB Insane/Hard/...", and so on
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Ѽ CTB difficulties modding assistance Ѽ (+standard) ~ Catch the Beat Rules/Guidelines Discussion Thread

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We could mix some with Touhou ones
Lunatic = Fruitnatic
Insane = Veggiesane maybe bad xD
or so.
It would be nice to have creative CtB diff. names/puns but if we don't come up with something cool we should stay with CtB hard/insane/easy

EDIT: I don't know if EZ2CATCH has own diff. names?
Maybe we could use them like Taiko does with TnT
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