|| For other Ranking Criteria: General|
osu! • Taiko • Catch the Beat • osu!mania
For the record, these include the recent changes made from the discussion forum. Any rule that is being discussed is listed here as it used to be and will be updated once the discussion reaches an agreement.
All rules are exactly that: RULES. They are NOT guidelines and may NOT be broken under ANY circumstance.
- No two hitobjects on the same tick (osu!mania game mode is an exeption). This includes hit circles, starts and ends of sliders, and starts and ends of spinners. Although this may be possible to accomplish while playing, it defeats the purpose of following the rhythm of the song.
- Do not overuse kiai time (the general guideline is one toggle per minute of playtime). Kiai is meant to accent chorus sections, so don't use it just for fountains unless you're doing this extremely rarely. You can toggle kiai off and back on halfway through the chorus if it fits, but using it constantly every few beats/measures is just ridiculous and can distract players.
- Do not manually edit anything in an .osu file that cannot be changed through the Editor. The only exceptions are .osu-specific storyboards and skin-related options such as SliderBorder and SliderTrackOverride.
- There must not be any obscene imagery in the background/storyboard/video content. This includes nudity, near-nudity, sexual references, violence, drug abuse, etc. Keep things PG, suitable for ages 12+.
- Approved Category is only for Marathon maps. Long maps with over 6 minutes of draining time fit the Approval category. Only then they are allowed to be single difficulty mapsets. If they are below 6 minutes of draining time, a full difficulty spread is needed and the map will have to be ranked instead.
- Mapsets must have at least two difficulties of the same game mode, one of which must be an Easy/Normal level. It is possible for Marathon difficulties to have only 1 difficulty, but it must be named Marathon for the BSS to allow the submission to pending.
- The mapset must have a well-designed spread of difficulties, containing at least an Easy or a Normal difficulty (based on how the map feels): this is so that players of all levels of experience are able to enjoy maps of the songs they love. It's really hard to define how a specific spread could work in a specific song beforehand, but here's a list of things to consider: the difficulties in the mapset must be in a consecutive order and/or with a reasonable gap between them; there should be at least one difficulty around ~2.5/3 star difficulty level; if your mapset has two difficulties, one of them cannot be insane (this basically means that it's highly recommended to have 3 difficulties unless the song itself doesn't allow much variety); if your mapset has three difficulties, one of them should be about ~2.5/3 star difficulty level, and the second should not be Insane; if your map has four or more difficulties, at least two should be something other than Insane. The difficulty level of Taiko-specific difficulties must also follow a well-designed spread with no jumps in between difficulties, hence if you may include Normal/Hard/Insane, or Normal/Hard or Hard/Insane (only if it also has standard difficulties)
- Each difficulty must be able to be played by a single player. Thus, Multiplayer TAG-specific difficulties are not allowed since multiple people are required to play them. However, you may add an external link to a TAG difficulty in your map thread.
- A mapset cannot have just one Taiko or osu!mania difficulty. If you decide, for example, to include Taiko in your map, make sure you have at least 2 Taiko mode difficulties and that one of them is of an easier difficulty level if it doesn't have an osu! standard Easy level difficulty. However having only one CtB difficulty is fine since
- Having just one CtB difficulty is allowed in an osu!standard mapset because standard difficulties are converted correctly to CtB. Thus, in Taiko or osu!mania mapsets you need at least 2 CtB difficulties since Taiko and osu!mania can't be converted to CtB.
- Source and tags must be the same throughout the mapset so that searching is kept consistent and clean.
- Eastern artists must be written in the proper 'surname firstname' format (e.g. Japanese/Chinese/Korean). If you're unsure of your artist's name, then check previously ranked maps, Google, Wikipedia, or ask a BAT/MAT for help.
- Vocaloid names must never go in Artist or Source. Instead, use the composer of said song with "Vocaloid" as Artist, the Vocaloid name can go in the tags; more info: http://osu.ppy.sh/forum/p/1767683
- Uninherited Timing Sections should be used to accurately map the song's timing. They should synchronize to the beats of the song as accurately as possible and use the correct time signature whenever possible. If an incorrect time signature would last for more than 2 bars, add another timing section to fix it. Please see this thread for more information on downbeats.
- Your map must be perfectly timed. This means that your BPM and offset are spot-on, sliders end when they should, notes are generally following a recognizable rhythm (such as the lyrics or drums) which is comprehensible by a player, and that there are no unsnapped notes (you can check this by running AIMod (shortcut ctrl+shift+a) in the editor).
- Uninherited timing sections must be the same in every difficulty of the mapset. That is, each section must have the same BPM and offset in each difficulty. Furthermore, there must not be extra or missing uninherited sections in any difficulty. A song's timing doesn't change between difficulties, so there's no sense in having different uninherited sections per difficulty.
- Uninherited timing sections cannot be used to manipulate slider speeds. These can be very unexpected for the player while also disrupting the main menu pulse and slightly changing the overall timing of the map.
- No two uninherited or two inherited timing sections should be placed at the same point. An inherited timing section may be placed on an uninherited timing section (but only to change the slider speed). Having two uninherited or two inherited sections on top of each other will cause problems within the beatmap.
- The song's audio file must be of reasonable quality. Try and source mp3 files yourself; ripping them from a streaming video site often results in low quality audio with high file sizes. The bitrate of a beatmap's audio file must be no lower than 128kbps and no higher than 192kbps. If you are having trouble acquiring an appropriate audio file, contact one of the more audio-savvy BAT; they will be more than happy to help find an mp3 for you.
- The minimum draining (play) time for a map is 30 seconds (but the recommended minimum is 45 seconds). If your map is shorter than that, then try looping the song with an audio editing program. This is so each map gives a high enough score, and also so people do not try and cut songs too short for no reason, thus stopping people from enjoying the song fully.
- You must cut your mp3 if you're using less than 80% of it. This doesn't count intro time, and thus only applies if more than 20% of the outro is unmapped. If you only plan to map a portion of your song, then including the full mp3 is a waste of file space. Many mp3 editing tools like this exist which make fading and cutting a song simple. However, if you have a legitimate reason for keeping your full mp3 (e.g. a storyboard after the map ends), then that is fine.
- You must use hitsounds. Without these, things get way too monotonous as you are throwing away one of the main elements of variation present in mapping. You don't need to place them on every note (and are discouraged from doing so), but they must at least be frequently heard when playing.
- Hitsounds from notes and sliders must be audible. These provide feedback for the player, and having them silent in a rhythm game doesn't make much sense. If you don't like the default sounds, then find replacements rather than silencing notes. You can use hitsounds from the Custom Hitsound Library or easily find others online. Lowering the volume of a few notes to provide a dampened effect is usually fine, but complete silence is always unacceptable. The end of a spinner (or even the entire spinner) the sliding sound of a slider, and the end of a slider can be silent, but only do it if it makes sense. Finally, you cannot silence both slider ticks and slider slides together.
- Songs/Maps with mature lyrics/themes must be marked with a label such as "18+" in the map's thread. This game is for all ages, and so a warning is needed for younger audiences. There is currently no way to distinguish this outside of the map's thread, but this may change in the future.
- Each difficulty of the mapset must have a preview point set (and be consistent in every difficulty). This is used for both the song selection menu and the online thumbnail preview.
- Every .wav file must be at least 100ms long to prevent issues with soundcards. If you want a silent/blank hitsound, then you must use a 0-byte .wav file.
- The video's dimensions must not exceed 800x600 for the 4:3 format, or 854x480 for the 16:9 widescreen format. This is so video files keep a decent filesize and do not increase the beatmap's size by too much.
- The video's offset must be correct and consistent between difficulties so that it follows the music how it was originally meant to be.
- The video's audio track must be removed from the video file. The audio track in video is not used in osu!, so removing it reduces that filesize of the beatmap.
- If you are using any elements created by another community member, ask permission beforehand. Respecting the work of others is paramount and most people will be delighted to have their work featured in your projects!
- Gameplay elements must be visible. You cannot make any element that will impair the playability of the map invisible as it will make the map unintuitive or even impossible to play.
- Skinned elements must be cropped cleanly so they don't look like they have jpeg or pixelated artifacts around them or half-cropped shadows. If you don't have a program like Photoshop, then there are many free alternatives like Paint.NET and GIMP that can be used instead.
- Background images must be at a maximum of 1024x768 pixels for 4:3, 1366x768 pixels for 16:9. Although 1366x768 (16:9) is recommended, most background ratios that are 4:3 or 16:9 should also work reasonably well (for example, 800x600 or 852x480). Using an image with a different ratio is fine, but will result in letterboxing (black bars at the top/bottom of the screen) or upscaling (resized image to fill the whole screen).
- Keep background imagery safe. Images should be on a level that can be displayed on all-audience TV, on public signage, and of nature that doesn't require censoring in any country. If you have any possible edge-case scenarios, please PM "ppy" on irc with a link to the image in question and I will start building up a list of images which are/aren't acceptable, to set some visible guidelines.
- You must have a background image on every difficulty of your map. If your map has a storyboard, then you can easily fade the background out, but one is still required for the song selection menu, online thumbnail icon, and for players not downloading with video (if the map has one).
- Hitbursts must be clearly distinguishable from each other (e.g. 300/100). The best way to ensure this is to use a different color for each hitburst. Otherwise, the player won't know if they're hitting beats accurately.
- When skinning gameplay elements, complete sets of elements must be skinned. For instance, if you skin hitcircles, you must include a hitcircle.png, hitcircleoverlay.png, approachcircle.png, and a slider border color (this can be done by adding the line "SliderBorder: 255,255,255" (using RGB values) under the [Colours] section of each .osu file). The same logic applies to hitbursts, cursors, numbers, and anything else of this nature. If you didn't intend to skin an element in the set, then using the templateskin's version is okay. Setting a SkinPreference is also acceptable (e.g. forcing the default skin).
- Combobursts must be oriented for the left side of the screen. Combobursts are aligned to the bottom and left sides of the screen by default, and are just horizontally flipped for the right side. Thus, you only need to worry about making sure that the comboburst is cleanly cropped on the top and right sides of the image.
- Do not make any essential gameplay elements larger than template skin dimensions (especially for combobursts). Larger elements may effect gameplay performance, and thus should be avoided. However, any elements that do not directly effect gameplay (e.g. pause-back, play-skip, etc.) may be slightly larger if a legitimate reason is given.
- There must not be any unused files in the map's folder except for the map's .osb file (since they sometimes get added even if the map doesn't have a storyboard) and storyboard .thumb files (since they are automatically created in image directories). Unused files add extra file size which is unnecessary.
- Storyboard images must be at a reasonable size for their usage. For most uses (e.g. full-screen images), the maximum is 800x600 pixels, although 640x480 is highly preferred. The editor is 640x480 at default, so there's really no need to use anything larger for full-screen purposes.
- The maximum dimensions for tall or wide scrolling images are 640x1440 and 1920x480 respectively. This is for the sake of gameplay performance, image loading time, and filesize.
- There must not be any unnecessary transparency around storyboarded images, so crop and resize them as much as possible. If there are particular reasons for apparently useless transparency, then please explain them. For transparent sprites, there should be at least one pixel of transparent border around them so that interpolation (e.g. a black-bordered image on a black background) works properly (although a shadow or glow around the image will fix this problem as well).
- Maps that use repetitive strobes, pulsing images, or flashing colors in the storyboard must use the epilepsy warning. There is one built-into the editor, which will display a visual warning at the beginning of the map and also mark the map's online thumbnail with a warning icon. Also, it helps to make a note of the flashing/strobes/etc. in the map's thread. This warning is absolutely needed so that players with epilepsy can avoid any danger.
Guidelines are important and should be followed in most maps. However, they are NOT rules, so they may be broken in special cases. If you want to break a guideline, ask yourself this: Does what I'm about to do make sense? Is it more fun to play like this compared to sticking to the guidelines? If you answer yes to both these questions, then it is probably okay.
When your guideline-breaking map gets modded, try to be as reasonable as possible: Do your best to explain your point of view and be open to suggestions.
- A maximum of three slider velocities should be used (including 1x). For example, you could have a single map using 0.6x, 0.8x, and 1x; or 0.75x, 1x, and 1.5x; etc. If more than three slider velocities are used, then they should make sense and be intuitive. If slider velocity changes are able to be merged (e.g. close values like 0.8x and 0.7x) while still flowing/working correctly, then they should be.
- When including a slider velocity change, there should be a discernible change in the map's tempo. A spacing change, a short break in the map, or a slider containing at least one tick will help show the transition between them.
- Make sure that you can pass each difficulty in your mapset. Continually test-playing your map is one of the best ways to spot mistakes and correct issues.
- Your difficulties should all end at the same spot. Having a fully-mapped Normal/Hard and a half-mapped Easy just looks sloppy/lazy. A full Easy may look boring to you, but not to a player that can't handle the harder difficulties.
- Kiai should be consistent throughout difficulties of your mapset (especially since it is shown on the main menu). If you have a guest difficulty from another mapper that uses different kiai, then it's fine as long as it still makes sense.
- Kiai should start on a white tick (or more commonly, the big white tick called the downbeat) of a measure. Generally, the main part of the chorus will start at this point.
- The song should not be too long. Aim for 3 minutes maximum; anything longer gets tiring. If you need help editing a song down to length, feel free to ask in the Beatmap General Questions forum.
- Use breaks where possible. Even if they are only 5-10 seconds, it allows a bit of recovery and hand repositioning for players. However, try to avoid longer breaks that are in excess of 15 seconds. Breaks should especially be used with Easy/Normal difficulties.
- Options such as letterboxing, countdown, and audio lead-in should be consistent between difficulties. Having cohesive settings throughout your mapset will look much more professional, although there are always scenarios where this is impossible. One difficulty might start at the beginning of the mp3, where a countdown is impossible but an audio lead-in is absolutely necessary; while another difficulty may start a few seconds in, where a countdown is usable but an audio lead-in is senseless.
- Try to keep osz files under 10mb, or 24mb if you include a video/storyboard. Videos and storyboards can generally be decreased in size by lowering the quality of the video or trimming/resizing storyboard elements.
- Avoid using storyboarded hitsounds. If a player misses the hitobject that the storyboarded hitsound lands on, then the hitsound will be played (which doesn't make much sense when this is a rhythm game utilizing audio feedback). Also, storyboarded hitsounds at places where there are no objects can confuse the player into thinking there was some unseen hitobject, which doesn't make sense either.
- Slider tick hitsounds are discouraged. If you want to use them, then make sure that their volume is balanced (i.e. notably quieter than regular hitsounds). A very loud slider tick, especially when only used once or twice, would be extremely jarring.
- Avoid going over a 5.0x storyboard load to help prevent lag on older computers. Resizing some of your storyboard images may help with this.
- The number of maps by any mapper should not exceed the number of maps by the uploader: this means that if you have 2 diffs, no guest mapper can have more than 2 diffs; collaboration maps are exempt from this. Ask a BAT if you're unsure of who should upload the mapset.
- Try to refrain from using names such as "Short", "Full", or "Cut Ver." in your map title unless the extension is part of the song's original title. If your map is substantially shorter than the length of the track, you can add (Cut ver.) to the title.
- You must fully map at least one difficulty of a mapset if you are the person who is uploading it. For collaborated beatmap sets, the uploader must be a part of every difficulty. Also, no guest mapper should have more content in the mapset than the creator. It makes no sense to upload a map if you barely contributed to it.
|List of guides in osu!|
|Official FAQ and Ranking Guidelines||Game FAQ • Ranking Criteria • Standard Ranking Criteria • Taiko Ranking Criteria • Catch the Beat Ranking Criteria • osu!mania Ranking Criteria|
|General Mapping/Modding Info||How to mod? • List of Mapping Techniques • Taiko Map Guidelines • Filling The Song Set-up fields • Making Good Sliders • Fitting the Size-limit|
|Skinning/Hitsound Info||Skinning in General • Making Properly Centered Spinners • Custom Hitsound Library • Adding Custom Hitsounds • Making the Background of Things Transparent|
|Storyboarding Info||Storyboard Scripting • Reducing SB Load|
|Video Editing||How to Compress Videos Without Destroying Their Quality • How to Add Videos taken from Youtube|
|Common Mistakes||How To Correctly Change Map's Artist/Title • Basic MP3 Modifications|
|Miscellaneous||Changing Title Text • Music Theory • Setting the Offset on the Correct Beat • Collab Information • Starting a Beatmap Project • Live Streaming osu! • Getting songs from Videogames|